Malicious PDF — malware analysis report

Static analysis result for SHA-256 43172943b20afdb9…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 04:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6af9a5055e9df2720b47195709367fde SHA-1: b900986dfeaf4d1f06547c8b5536725006a6d84f SHA-256: 43172943b20afdb9216a918b711229d0c851f4dd64ecbd57b0180456a8899998
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=09g+transmission+fluid+fill+adapter+tool+kit PDF link annotation
    • http://insurancesouk.com/how_much_would_it_cost_to_replace_refrigerator_compressor96erj.pdfIn PDF document text
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/8469989.pdfIn PDF document text
    • https://sibewelile.weebly.com/uploads/1/3/0/8/130815008/69db565b051c.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/8552954.pdfIn PDF document text
    • https://kerusovaxi.weebly.com/uploads/1/3/5/9/135978613/15e3165.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/2362884.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/panafumew_xuwegojotako.pdfIn PDF document text
    • http://openlait.pro/cradle_to_cradle_or_cradle_to_gravevh58d.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/71d43b0a0f7efe.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/6126187.pdfIn PDF document text
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/zarujabitit.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/zabuledobok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zamuriza/muwevojoji.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/20111914985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839a7e43-5ccd-4850-9a53-f564ae1412e8/68783922726.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/yealink_t46g_quick_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/81386894125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff070c3-e021-4bb0-aa6b-e5471dac1ab9/zofejigurogut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65679095-6e2a-4b3b-b5fb-8e3235a7b392/56048566340.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 5628 bytes
SHA-256: ced5c2a2dd03d51e1feee2006c03875018bf1651ecaa7fb7f0fac7b77ce5ae0c
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 10124 bytes
SHA-256: e35ce7dc79edec67b8219aac36509f8e80b651703571a6796565938d20eed898

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