Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f079223c15fd54…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 02:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 967ae1278d7da387152b1bd6939b825c SHA-1: 0432fd9c6cc0cdc02dbab252c12a7911e8d377c0 SHA-256: 71f079223c15fd5400a759d5f69e2bb63dc40349fa5a165ab261b5d19d639e77
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded links, including one to 'maypoin.ru', which is flagged as a potential phishing or malicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a tactic to distribute malicious content or engage in SEO abuse. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://maypoin.ru/award?keyword=intertherm+electric+heater+parts PDF link annotation
    • https://zexebofefibem.weebly.com/uploads/1/3/5/3/135303963/lusopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fc7c1422aec5.pdfIn PDF document text
    • https://mutixuvuv.weebly.com/uploads/1/3/4/6/134665255/6576372.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/552c7e1759a132.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/5423d1dfc1107d.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/jebupofedijakuk/levavosil.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/zuroburufebikex.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/10212513004.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/medical_representative_resume_for_fresher.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/48546864923.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/a_moveable_feast_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/little_foxes_wigan_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/c._i._d_episode_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/brother_mfc-7340_toner_life_end_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/autodesk_2015_xforce_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/family_limited_partnership_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/kesixokidipu.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/brighthouse_annuity_surrender_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/wesexexonixutediluluxow.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 5112 bytes
SHA-256: 63586cbc841d57634103e4c97c6c8755943f76306137ba32209bf9221bd297d9
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 10228 bytes
SHA-256: e62f5032fe26da146f7f9489e189dc1ba45a0262ed62653463d8e1f801244e39

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