Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44746e5022a1e30…

MALICIOUS

PDF

67.8 KB Created: 2021-03-03 17:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6827d61188020ec36e5261ab230f408 SHA-1: d82dc4884c62eaf6bf7a83f382775aa756c5dc06 SHA-256: d44746e5022a1e30d4c2fc41c48399d1e73099aece3b0bd3375319cf095eafd7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=volume+of+compound+cuboids+worksheet+tes
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5fe45029acca5.pdf
    • https://monaxakapivelor.weebly.com/uploads/1/3/1/1/131164425/raduwejexazef-nogav-fewazen.pdf
    • https://nenefifozotuve.weebly.com/uploads/1/3/0/8/130874038/8815348.pdf
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/7240870.pdf
    • http://stat-index-co.com/python_machine_learning_book_by_sebastian_raschka_freehewdl.pdf
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/3337e36f2ef955.pdf
    • https://dukifuti.weebly.com/uploads/1/3/1/4/131437117/badofu-figamewefi.pdf
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/631229.pdf
    • https://cdn-cms.f-static.net/uploads/4454822/normal_601b0661620aa.pdf
    • https://cdn-cms.f-static.net/uploads/4447906/normal_5fdc105078b93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kewivawegimomu.epizy.com/architecture_images_hd.pdf
    • http://zudosikewemer.epizy.com/grammar_practice_test_with_answers.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cacc.bin
fcd20e0b7e2333c1b40f18deb52b542c9d7ef808ffef68f53fa825bf4ff4b941		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 5448 bytes
font_01_sfnt_off0000dd43.bin
babbb745e287e534865be465ae3d1453b6bbd6cc8683ff5ee55dd02dd2c967db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 10804 bytes

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