Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a1903f24e8f7df…

MALICIOUS

PDF

73.9 KB Created: 2021-04-01 20:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fc8f786104261ce8c4a53729bd21a3c5 SHA-1: 2bdfa5d91df793217e12c9f443de7565a18e47c8 SHA-256: 93a1903f24e8f7dfe0074022a0d4318369ab154e895b0734c0c56906f22f822d
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 or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=sample+letter+thanking+professor PDF link annotation
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/wixurexuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_603057e3720be.pdfIn PDF document text
    • http://gemajesubon.22web.org/dengue_guideline_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601f1e9d65c5a.pdfIn PDF document text
    • http://lanufutado.22web.org/xetariwobasabafoxotoziti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5fd85eac739e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5fe3af2d17b11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fcd44e44cfd3.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/weleg.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/567058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_60342f7272335.pdfIn PDF document text
    • https://kujuroledok.weebly.com/uploads/1/3/4/0/134040703/345763.pdfIn PDF document text
    • https://sebuvijanamo.weebly.com/uploads/1/3/4/8/134856810/6929229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_6049d0225da18.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/3858353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_bb12defc2b774dc39c0ac2f94f1ca181.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_8c2535d9b6744bd7ab7d8204d98b637e.pdf?index=trueIn PDF document text
    • http://gagafexekoxoseb.epizy.com/nonim.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/28771696687.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_930d56ba61294c939156fa6e8ade8967.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5484 bytes
SHA-256: b935d1537ffc9cfb3d0f7d2fae9796a0ba04d2862ec70e834c0982f1a2462704
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10380 bytes
SHA-256: 84c03bdb4d6e309cecf991bead30495a40d95f168852ea4a836c59fe71df0399

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