Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c397930fe233174…

MALICIOUS

PDF

75.8 KB Created: 2021-04-01 22:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2d87ce8b40f656daab65ffc39cb930da SHA-1: 42051420396a825ba212082c156e69a0fb4e531b SHA-256: 6c397930fe233174dd51f5bd7e3995b86c0610b40d3680b11c06919c4c647c7a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/123?utm_term=careem+app++old+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470205/normal_5fc6211e41bb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fceabb28fc4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6023cbfe01e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_60330ed4d3967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6020bad70a94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_6034838c17413.pdfIn PDF document text
    • http://nasty666.space/lexigemogifurunekeladorzbhqg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5ffbfa40661f2.pdfIn PDF document text
    • http://amst-watch-v2.club/44349988163zb7nf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_603ea7d885da4.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/akqNiht/46283364360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_601810c0cb70d.pdfIn PDF document text
    • https://cdn.sqhk.co/bafuberudod/ddlqRjg/toxeriroweza.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/dhdh0gf/focus_bank_mobile_banking.pdfIn PDF document text
    • http://legendbilisim.com/red_button_quilt_co_patternsxsc5s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386334/normal_5febc8fe76e91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_60481d6b0e93c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_44f4e642ad964f469465c41905de835b.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_9ee1441f0398432397f9e1f1149d85ff.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_e5c856d9a63d46a9aeb4876d17a914f8.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_c3884fdefde9470b8775572205f21691.pdf?index=trueIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_831939bae6754dcead813681ce97309e.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 5068 bytes
SHA-256: eecd71c504d948ebd3e556b951106216470498c66bc2f06f51f124d22fd40d3d
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 10468 bytes
SHA-256: 8e9a8c307aeef53e461092ffbebd87efb066279d81d5bd0420e0e0cdee80a716