Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a645efd5595f245…

MALICIOUS

PDF

70.8 KB Created: 2021-04-01 01:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20944160be568cc9ca490b146b37ab04 SHA-1: b0bb70243b75b4a5b595de4857201e2848a11b23 SHA-256: 3a645efd5595f24529d01b91d996a8aedfed33d35c3871510875e949114a4f8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=ro+leveling+guide+mage PDF link annotation
    • http://flebolog24.com/729132621052pdz1.pdfIn PDF document text
    • http://momexatajuma.22web.org/jewadisutokevedane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcd3ae4625c4.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/73112714473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420748/normal_60095070928cd.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/89942804876jo4dq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5ff190b929a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60445f6772e92.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/46229100444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_604e978d5d1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_0d99ef98a10d4842969c7094e407ac09.pdf?index=trueIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/50746900141.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_84f9b4af472c49a0b5abc4487a23315b.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_3405be552d244f34830f30c88201f04d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/bible_stories_in_tamil.pdfIn PDF document text
    • http://kanisal.epizy.com/lagu_ahn_jae_wook_forever.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/59152098161.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_556d559856084a28b6cf89314189ce60.pdf?index=trueIn PDF document text
    • http://wupepiwora.rf.gd/ax_2012_ssrs_reports_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/37044379775.pdfIn PDF document text
    • http://luregaw.onlinewebshop.net/cadastro_ambiental_rural.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/reducing_fractions_worksheet_math_aids.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 4940 bytes
SHA-256: 02490f75edf2898731553f0a7bee8e8e6910b0e1207e69870c3eab0c8cc58734
font_01_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 10316 bytes
SHA-256: d5d0ff87182ebe0782b2796b297bb02dc3addc3c590d5cfc00d6fc12dc22cc2f

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