Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef6b47459fc8b03…

MALICIOUS

PDF

88.4 KB Created: 2021-03-23 13:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec37777b42a0ed35b66c66b37150cac SHA-1: 72c28d15c692ba94d5a3c30f40550db891d732ad SHA-256: bef6b47459fc8b03162f6263ffcc64d6d1119180e4c12273a974b5999774eda2
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 pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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/123?utm_term=worksheet+2+sentence+fragments+18+exercises+answers
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/3622587.pdf
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/6472841.pdf
    • https://mowasedexalobir.weebly.com/uploads/1/3/4/7/134743102/c7291b95a9fe1b.pdf
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/eb3baf21917.pdf
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/jutujadilareret.pdf
    • http://viduzunopiwofik.22web.org/coraline_movie_songs.pdf
    • https://nupezodebugu.weebly.com/uploads/1/3/2/3/132302780/6e7a87dc.pdf
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/0beb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_243096c3b14d451c829666261dea00ef.pdf?index=true
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_a335a80339804bfa93f13309167e9f37.pdf?index=true
    • https://s3.amazonaws.com/gewisetug/alter_ego_b2_plus.pdf
    • http://putajamesar.rf.gd/list_of_antidotes_for_drug_overdose.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/jazz_novel_by_toni_morrison.pdf
    • http://radujexoxetapil.epizy.com/9813792026.pdf
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_aab806406d6146e3848f6db6a630d94c.pdf?index=true
    • http://wugepigen.epizy.com/samsung_mini_split_cf_code.pdf
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_5b29874be0354bd8b688cdad88a323ba.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c30.bin
b1d07afe7486b5c4d2659257d7434a742544edd3177a93b67eb77d2a134f3084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 5668 bytes
font_01_sfnt_off00011f68.bin
525d265ca5cb0265ac295ada7fae6cd45012141316d0fe88d90dc09f32a8a01c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 11304 bytes
font_02_sfnt_off000145ff.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145FF 4324 bytes

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