Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca75411a53c32a2…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 01:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 63ee580dac27a79f7a47a22ace2636d7 SHA-1: be5a22fa64c0c83d9f4e92bdc24c6845ff00e0b3 SHA-256: 4ca75411a53c32a2b5feeb063bac97409b09a53eb8c04efdd728abb4c374ce23
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 or link farms, indicating a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pelibifir.ru/wix?keyword=fs-th9x+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/lewulula/dLggjj0/79631698332.pdfIn PDF document text
    • http://idealica-it.website/floppy_phonics_flashcards73wq8.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/igig2iR/76857362504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60624098a43d0.pdfIn PDF document text
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/1a514d21a2a79b.pdfIn PDF document text
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/5331678.pdfIn PDF document text
    • http://modernstyle.pro/2269097051jle99.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/puxufizokobipe-judufiridebaku.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/jedital.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/481084b90eff.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/8WvjghA/merge_duck_mod_apk_download.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/vudetujem-mozunuloj-piduga.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/tarusitufog_lekawazupal_tepenutiwop_dudosetatebuteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe6df7f56416.pdfIn PDF document text
    • https://xopilinunerixaw.weebly.com/uploads/1/3/1/3/131380618/rofofatu.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/df634e17a08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fec0bc531a58.pdfIn PDF document text
    • http://everydays.space/certificate_of_authenticity_card_templatek7tq2.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/99d2ce336ce06da.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/4636254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475562/normal_5fcb1bea5403a.pdfIn PDF document text
    • http://mexicotop3.xyz/34858966372qaps2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5ffa3220877e8.pdfIn PDF document text
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/pokumede.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5000 bytes
SHA-256: 45fd261e353f689eb0af6d681c6fd8630ca124019857b20683ef8836c3c54804
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 11264 bytes
SHA-256: 211003b0c636f2a83c7406eb3294fd065ad0b42febb67b55be80c55db452f1e9
font_02_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361