Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b762d368f0b0850…

MALICIOUS

PDF

91.1 KB Created: 2021-04-10 01:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 20bbbd91db44133d650f2ec3e091b657 SHA-1: 25739990a8d99b7b90980013dbff8c3ea63b576c SHA-256: 6b762d368f0b085080a5d42a44f08feb656900cc510c190fe949f5c8011166ee
186 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to numerous other PDF documents, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a larger phishing or malware campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=attack+on+titan+anime+movie+part+1 PDF link annotation
    • https://cdn.sqhk.co/lewoxiguj/zffdiii/fifotas.pdfIn PDF document text
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/b2dd94.pdfIn PDF document text
    • http://itdiscount.info/30773503704krojy.pdfIn PDF document text
    • https://gikopefexibog.weebly.com/uploads/1/3/0/7/130775531/93345e0e605cba.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/jciiFig/crash_drive_2_mod_apk_3._70.pdfIn PDF document text
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/3992869.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/hh6jhcZ/reporting_entity_l_g.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/ajcOgcF/business_relationship_manager_en_francais.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/AjcjikO/blood_pressure_medications_that_start_with_l.pdfIn PDF document text
    • http://national-verifyteam.com/tomomikawodosudazesapa49aj2.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/cx3jf5Y/reckless_getaway_2_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/Mib9hfR/lezajanobab.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/87a07b1.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/beninamo.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/jfjaqjb/prison_break_cast_season_1_escapees.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/a64e1b17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_75d2613fc1384c1b9fef3e313fe86257.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_2ba6417453e14b9f944f896db9f73af6.pdf?index=trueIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_84775b40072d437f8d2050916922ed30.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_54f0a19dd4424c3ba7f167b6f1267371.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_082009e760ef4070a1caf733d9257d0e.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 7036 bytes
SHA-256: 52479fc67b7980f6aa176c15d0d00ee378044a0d295760ff1c71dc7540063212
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 5036 bytes
SHA-256: f24b6500f16884762903775b0f31e0be067566c68467fd3f2378612b0d15a38e
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 11988 bytes
SHA-256: 28c87d457ce96684051323fffefd67f592d8a5db0a2a71754341f82a4f7ec1d1
font_03_sfnt_off00014749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 16572 bytes
SHA-256: 75b57b516fef10a8d6cdca7b92136f437560884a491dec3428e17b839eae1101

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