Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bfa7312419a5fe…

MALICIOUS

PDF

74.3 KB Created: 2021-03-02 15:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c2efd589387b3bef2296720d40dde0c SHA-1: 6dabaa8fcdbbf535a9bbed42e2503d2c63ac2e97 SHA-256: a6bfa7312419a5fe8aea5ecca95149a107c9d7c79201a56ba6e127c0f8529eac
186 Risk Score

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 0.9997

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://mezovuduw.ru/123?utm_term=how+do+i+contact+the+post+office+about+missing+mail PDF link annotation
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/2324808.pdfIn PDF document text
    • http://hr-insider.com/acknowledgement_of_a_thesis_reportrxnmm.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/sefikogofamu.pdfIn PDF document text
    • http://fifamarketbot.com/83458283038b90lm.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/tewexomisowopu_fupevipofiwim.pdfIn PDF document text
    • http://filanion.online/rukepaxozunidifiiunfo.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/fudar.pdfIn PDF document text
    • http://apeech.ru/word_trip_uae_level_6_answerseixfu.pdfIn PDF document text
    • http://iciko.xyz/mutoturuguzitelufrwkc.pdfIn PDF document text
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/490da3047711.pdfIn PDF document text
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/1000407.pdfIn PDF document text
    • http://fabulouss.space/why_wont_my_hot_tub_turn_onl7plz.pdfIn PDF document text
    • http://wordwild-store.com/racing_gears_advance_onlinel5ij3.pdfIn PDF document text
    • http://organize.shop/adverb_of_frequency_worksheet_for_class_4p8ynv.pdfIn PDF document text
    • http://farvestnn.ru/french_learning_book_freea1ywc.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/af97994a8785429.pdfIn PDF document text
    • https://zoladawa.weebly.com/uploads/1/3/4/1/134108991/7159462.pdfIn PDF document text
    • https://dipofivebizog.weebly.com/uploads/1/3/2/7/132712563/6818685.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/jiwenigewozizuwu.pdfIn PDF document text
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/favebetulumek-waworep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 5668 bytes
SHA-256: 7022716b512880ec280237092663b45cb861ce49eb754cdee0539ae9e520e203
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 10684 bytes
SHA-256: cfa5e3e6b5013c733d7c2341195a82269901400e1eda0243e788193dfb9bbc82

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