Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b64d950289fe83…

MALICIOUS

PDF

83.4 KB Created: 2021-03-13 15:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a25e25b1401611b2bb966d957c603c7d SHA-1: 64b6a23172b7cbb1d034ecb5c36c6d03d205e475 SHA-256: a1b64d950289fe83bae7f59fa40d66bce876ef4d45c48d745ca8abbed97a46e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • 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://xezojetit.ru/wix?keyword=whitebox+learning+glider+answers PDF link annotation
    • http://wuxetij.mypressonline.com/adverbs_modifying_adjectives_and_verbs_exercises.pdfIn PDF document text
    • http://websecurer.tech/joxapumefikkxv4i.pdfIn PDF document text
    • http://esclub.info/pexukewalutenewubigewam7ekr.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/45981968110.pdfIn PDF document text
    • http://1yamal.space/what_is_opponent_process_theory_in_psychologyabskl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5ff2d8a979abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455916/normal_6039f3dedabe1.pdfIn PDF document text
    • http://liko-sneakers.com/free_paranormal_romance_novelsq9w0s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepaxilex.epizy.com/milek.pdfIn PDF document text
    • http://gasigigi.rf.gd/what_is_abstract_in_research_report_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1ce437-aff6-4c07-b504-b095dd461074/gadisomixi.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_89e69e8474824c50be1fbcc86988469b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b9705b-6677-4ee8-88e3-0a3ddc94efee/jerolisulixexifawimuxe.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/xironilotutogidekeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35b1195-6f99-477a-8535-6418ea7bed17/zogezebijenawaga.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_645f0eca3050415fa982a450f5f728d3.pdf?index=trueIn PDF document text
    • http://jopasimu.rf.gd/77350888214.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_775b93557dea4978a06ea351e6ec1c83.pdf?index=trueIn 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_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 5400 bytes
SHA-256: 364cf6cea325e1df72d54d188b38681b8bb4588cc669e01878771ce9f89e03ab
font_01_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 11944 bytes
SHA-256: 9ba40f998e4c17379d898c001e3c0ca21e8bfe5fe4c67d6357fd718576b73533

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