Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d73ca782e4dcd8…

MALICIOUS

PDF

41.3 KB Created: 2020-11-06 19:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ccee2469baba470c62d42ac7c2697e63 SHA-1: 20bd6f5ae24af7aa55d4dac6be60ceac339ccaec SHA-256: 66d73ca782e4dcd86d2c7df6ae61378b2bf26f9859ad9935fd18201bd4ab85ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains like weebly.com, forming a link farm. The primary URL, https://trafffe.ru/aws?keyword=change+in+accounting+principle+fasb, suggests a SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to a traffic generation or content distribution scheme rather than a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffe.ru/aws?keyword=change+in+accounting+principle+fasb PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/6059365.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/jivudugog.pdfIn PDF document text
    • https://tisefujuset.weebly.com/uploads/1/3/4/4/134488269/b43efcd8715b1.pdfIn PDF document text
    • https://lebidupevi.weebly.com/uploads/1/3/4/3/134319251/6105905.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/xobonila.pdfIn PDF document text
    • https://jinezosibe.weebly.com/uploads/1/3/4/4/134454760/1487134.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/xanovit_vaxixerup.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/052c2f5.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/vinebev.pdfIn PDF document text
    • https://biwilodumiz.weebly.com/uploads/1/3/4/3/134319983/pesusakunox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fa005439fde9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b2c9ce-bf1a-4366-9ac2-f099d422f06c/barrier_of_communications.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6499 5320 bytes
SHA-256: 2fe02a94aa0f7996730376fe85bc43b48291bc749603d44525527002f0f24eb3
font_01_sfnt_off000076a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 9936 bytes
SHA-256: 24ca4e71ac665263f1c7f46fc9b0ef74b30b1115e9561cf5239fae161a3703ea

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