Malicious PDF — malware analysis report

Static analysis result for SHA-256 e315424b0e44070b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-05 03:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5bbfbf176324516305a877b7a87b5a21 SHA-1: ceea1d91a95f548b3a4aeaaf4262bf99018db9fb SHA-256: e315424b0e44070b221ad82a23fcd2bfaaf107edce264a43bb2e3bcdda2503eb
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO redirectors and link farms, a common tactic for distributing phishing content or malware. The presence of a UTM parameter in one of the primary links suggests a tracking mechanism for a phishing campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=lost+girl+show+season+1 PDF link annotation
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/miluj-piwizisiv-wepixix-tutatunozag.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/hcXIjbL/my_cordless_dyson_smells_like_burning.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/f1aa94858faa.pdfIn PDF document text
    • https://pijatopug.weebly.com/uploads/1/3/5/3/135303623/kotod.pdfIn PDF document text
    • https://cdn.sqhk.co/jameleber/GohctIw/chemistry_notes_for_competitive_exams.pdfIn PDF document text
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/4075126.pdfIn PDF document text
    • http://housefashion.ru/17907333493i1cdj.pdfIn PDF document text
    • http://yoganchik.space/86594008440v3whc.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/2807605.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/fgiiaWK/99724570956.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jFxr8jg/download_game_tank_battle_heroes_mod_apk.pdfIn PDF document text
    • http://muzoc.xyz/19983359644l854r.pdfIn PDF document text
    • https://bimuwalunamen.weebly.com/uploads/1/3/1/3/131384226/munizasewaw.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/tolivajupeku/chemical_bonding_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/you_raise_me_up_violin_sheet_music_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd59da8-8ef9-4efc-83db-afaf6981ef12/zufasaror.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/47084243400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273d9e7e-856b-4955-abe3-af13daeaf579/xusaxowotepupemitegakutu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/9408331798.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_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 5032 bytes
SHA-256: 4c2641b070fee994d6b1a66aa01287a602fbba8dc68906aa63775df50e27cb08
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 10696 bytes
SHA-256: 61affde75a78cedc9c9a46c7381ce21854cfdbe5541948fb85a6c92ebd767072

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