Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1e923014d84193…

MALICIOUS

PDF

68.7 KB Created: 2021-03-15 01:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4fdcb7962a8b61313f2568809294840 SHA-1: 2dd4bf43e2413e7418f5744574ef43f4db7da5bf SHA-256: 4b1e923014d8419381f71256a15083d8c91c4c24c8014c2cf98cdc45d14df93d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, embedding numerous URLs that point to disposable hosting, likely to distribute further malicious content or engage in phishing. The document body, though heavily corrupted, contains text related to book downloads, suggesting a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=the+immortals+of+meluha+pdf+free+download+in+tamil PDF link annotation
    • http://ulekschool.online/python_programming_language_wikilk9ws.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/reketizel-ketalewidazed.pdfIn PDF document text
    • http://filfex.ru/kannada_astrology_app_freealc05.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/1c07abca06df41e.pdfIn PDF document text
    • http://avit0.pro/60740636910t5l5a.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/savepewuzotufi_kevisoka.pdfIn PDF document text
    • https://nuresipaxujetun.weebly.com/uploads/1/3/4/6/134683077/f606196d44b.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/free_fonts_for_macbook.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/2694270.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/2024568.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/numeroputilu_befipojuduka_weviwagizu_pomedigorutez.pdfIn PDF document text
    • http://cocobeautybar.ca/59123701975lrsax.pdfIn PDF document text
    • http://libotopatolar.iblogger.org/96656718707.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/norefigajiponafaloru.pdfIn PDF document text
    • http://study-english-02.space/72498803084vh5o6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvogiwuxibi.epizy.com/break_even_analysis_questions.pdfIn PDF document text
    • http://gigezevozaf.epizy.com/wijimoxugixaredenopewobig.pdfIn PDF document text
    • http://gizolejonig.rf.gd/6352084254.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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 5324 bytes
SHA-256: a0f51e7450b0f9bd6aff0cfb2c8ce4a0c9c1b2d8a2b9b67f2b20cb5c3de0c841
font_01_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 10592 bytes
SHA-256: 1cfa2ec1b193b2254f18b087eed4a7528d156822df156798d14eaf2788533535

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