Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a19fcaeca4a444…

MALICIOUS

PDF

103.2 KB Created: 2021-04-02 17:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 849562191e85c0c4fe3d20c756495bfd SHA-1: 27b1b3f8d9faf6c6426b3ad8b076b4729b41f069 SHA-256: 04a19fcaeca4a44485119cacdab7fe89afd166c5c86208f86832f588239876a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDFs, suggesting a tactic to distribute malicious content or manipulate search engine results. The presence of embedded URLs and the overall structure point towards an attempt to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/123?utm_term=cystitis+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf PDF link annotation
    • http://reduslimitaly-ufficiale.site/15599960705ygouu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600fc052460a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473039/normal_5ffb7a4c3a3d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_6044215eee173.pdfIn PDF document text
    • http://forpost-electrica.ru/mazeruregikajogukajojibaj9bmvq.pdfIn PDF document text
    • http://rodina38.ru/xupipibapowevazitifumaju7ayus.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/meralgia_paresthetica_patient_information.pdfIn PDF document text
    • http://b4shop.icu/animal_english_song_freehaduh.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/varicocele_sintomas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_60421f6d5807c.pdfIn PDF document text
    • http://geekcods.com/kuxerazojespj3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fd9444c87eb9.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_28a84bafc0c940d28a97fcf8a6ad9abe.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/wugotenoke.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_05c81260115e42c7ad146fa216590d62.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_d77f673679e64370a4828632609cb8e6.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_71da3e9fc98142468eb3c58abdfe2716.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_0b5a14d7609c4600b6e540d6f8333b45.pdf?index=trueIn PDF document text
    • http://sijadogif.atwebpages.com/75180789739.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_a56f0923c9c44bb8963da8909567e147.pdf?index=trueIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_f9e4597e4f7c4b298dfcc1aa8430d8c6.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_e24e622236b142f2b5cee9222889e0dc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010bc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10BC1 17176 bytes
SHA-256: 8ac69dd0d3c5785783949c0a1ffa7a36ed696100001e3449e7e37c2f48eb3bff
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 4704 bytes
SHA-256: 1e15c8e4fe330540f52bb85fdb74d55943c0f8b28be43c8defd9b5b01d541569
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 6180 bytes
SHA-256: 52355759f6ba1634ebf803835453c5f0cbcfa1783c35bff7bbad6af133335d0e
font_03_sfnt_off000139e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 6900 bytes
SHA-256: 26a8b90b270311eaafd4a0c9a001214f6e06618fc80c7ece54db6efc775c09c3
font_04_sfnt_off00015096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15096 10548 bytes
SHA-256: c58e69cdef7f0a666989a0edf012e3d39c2a7f32e3b9dabc7e0e102c67051d58
font_05_sfnt_off00017494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17494 16516 bytes
SHA-256: 2ce295a801f4a07c6696b5f5f082d08e1b14586c47ad2040a3139e687fdcb34f

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