Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d4a21d8544c178…

MALICIOUS

PDF

137.4 KB Created: 2021-06-04 08:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4fa4c593a0c5f67cd6891cf52d46d248 SHA-1: 5e54977edcfb9f00da359282d9565520a76acc6f SHA-256: e2d4a21d8544c178d108454224e2abed819733bf4a90a8f48c8cd8bae1c971eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it is a phishing trojan. Heuristics indicate the PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to an 'answer key' and 'worksheet answers', aligning with a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://cructi.ru/pbw?utm_term=answer+key+selma+movie+questions+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368505/normal_5ffad1c201df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5fd3d9e25babb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_60110b3212ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5fce7c0f0c970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fd1342d17d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fe900a1e84f0.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/bamoforelawo_dogebizoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_606d014b016a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500677/normal_5fec5b06034c2.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/68eaf30903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_603e5fd3a0530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_604e159e4990d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5ffa9e067337c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_6012fb1c53969.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/parurasebumudoxor.pdfIn PDF document text
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/265ca85a79ea53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fed40a84d835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_6015fc4ea70d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6045d4dbcc77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_6064d98ad15dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fe12499c4a83.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/87be6adb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_604937d50a62f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_600f279bdcb3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalomuzavege.pbworks.com/f/best_childrens_electronics_kit.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411420/72258990565.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144436497/95241803234.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_off0001dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBF6 5356 bytes
SHA-256: 5b245a18261b46da3da55a8ba162cd4fbacb5d7762dfe49b2ca20f6dfeee5178
font_01_sfnt_off0001ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE22 11664 bytes
SHA-256: 941623fbc46ee2473a8a1fe44bb064f270745726c50b97e2d2a23cd27275686a

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