Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecfb903032bcafd…

MALICIOUS

PDF

84.9 KB Created: 2021-04-01 03:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2ebd3b01f1603ae2e13d5141660b5f30 SHA-1: 04d8ef029b8dd035ffea76ced307eb7117a40067 SHA-256: 3ecfb903032bcafd0e55a3a8eeb79a79dfcb0764e20cee215bd6866dccc5b99c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm on disposable hosting, with numerous URLs pointing to PDF files, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, aligning with the file's metadata and its likely purpose of masquerading as a legitimate document to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=biochemistry+concepts+and+connections+test+bank+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fd8d5a11fe25.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/punawenijopewusosu.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/41676228247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_6052ad02a6be3.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/burj_al_arab_restaurant_menu.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/57719504787.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/atlas_copco_compressors_llc_rock_hill_sc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_6026100a7b33b.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/bise_lahore_matric_result_2020_gazette.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/sharp_portable_air_conditioner_cvp10pc_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_602ab1d6cd092.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/samijizonumadivakej.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/vilomikatunetogasitogal.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/34486917658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_602b6ae0e942b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_3d33ecbfbf14475fb81502d81077ca3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4c99bb-5fcf-4bfc-80c0-11eecf205029/gowotatiduvirewobuw.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_81d2d93b8de34c0ca156cb38498c5f5e.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_5ab520b908104848a2134a8e6712790f.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_e19cc298f0474693845a92c7b5b32eca.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_f7ae775178074389bc1bdda7c6a957df.pdf?index=trueIn PDF document text
    • http://xemigososefof.atwebpages.com/is_all_souls_day_a_public_holiday.pdfIn 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 5508 bytes
SHA-256: 74688a436dcb6a7be80cc62ebf1c8aec8cfe21adeaac4612673fa28f7137bebe
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11960 bytes
SHA-256: b710ca0bd5322854da10fd09464a3bc7a128e920328564c1139ef00b95b00054
font_02_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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