Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e805d2336ac697…

MALICIOUS

PDF

76.9 KB Created: 2021-03-27 10:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e238ba9eb71b00b38589bbb62e3e45f1 SHA-1: ed9e32ac6215f6ced8c84f9d48434aaec4b57386 SHA-256: 31e805d2336ac697f5fc833211cf61af14b51feb4f5cf60de25a8ef09a25e141
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to a site that appears to be part of a SEO scam. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to potentially malicious or unwanted content, aligning with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wb?keyword=how%20to%20choose%20a%20pool%20pump%20and%20filter PDF link annotation
    • https://cdn.sqhk.co/wakivugex/i6ifQSJ/rolling_stones_albums_covers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_604e4baee2f3d.pdfIn PDF document text
    • https://cdn.sqhk.co/fevazufalul/aicsnjf/zombie_killing_us.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_601de0c06e1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_605c211131cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/hhH6Qgi/james_charles_followers_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/fJijidB/podagabub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_603035f9ac800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5ffdfeda1462d.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/jusagi/rifajebif.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/free_calculator_for_ipad_2.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/96609959468.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/denaxexeler.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/wabanabigatogutuza.pdfIn PDF document text
    • http://bijalupukupami.rf.gd/best_vocabulary_words_for_ielts.pdfIn PDF document text
    • http://jedirolin.rf.gd/sunikiwige.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/35220247904.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/michelin_star_guide_bangkok.pdfIn PDF document text
    • http://rofogaxadu.epizy.com/18389617160.pdfIn PDF document text
    • http://dukutogesedu.epizy.com/diary_template_for_onenote.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/cissp_all-in-one_exam_guide_6th_edition.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_34d8402827ca40a6bc09ab2459a8d9e1.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_720ecffb55544afebf0d8fd7e6322d88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/apsc_form_fill_up_date_2019.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_f6944a572a644679a8eee65631be6c17.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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 5448 bytes
SHA-256: 2e9887659f07f982a92c1c2051a7c12bfd3987132e826fccfe1984cbc4190339
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10520 bytes
SHA-256: cb8cf02facebea5ae1c305b73f98f3ce1165aca2b5b5d46f67292054287c147e

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