Malicious PDF — malware analysis report

Static analysis result for SHA-256 383e5997ef7e337e…

MALICIOUS

PDF

70.2 KB Created: 2021-03-01 14:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f84147f6273b4ef01fcbd1102f3cd1 SHA-1: 902ed38ee3260b36cf14b1e1ce18a6d971777839 SHA-256: 383e5997ef7e337e425d878d0a8e79ec624fb1e921e0a3d2fa82af16130281ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a site that appears to be part of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=lipids+worksheet+answer+key+are+lipids+organic+molecules
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/6670b55c0e69.pdf
    • https://jagefebasedi.weebly.com/uploads/1/3/5/9/135993187/8107652.pdf
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/7343495.pdf
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffbdef2c6445.pdf
    • https://cdn.sqhk.co/mopewedote/iJZoReu/happy_orange_thursday.pdf
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/samigoke.pdf
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5fe4928939c7e.pdf
    • https://cdn.sqhk.co/lixejudazeza/ayPk5jj/lady_riding_a_monkey_wrench_tattoo.pdf
    • http://jebewif.22web.org/rinazomosuwerexoxivefuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rabewiruzitewa/cameraman_gangatho_rambabu_video_songs_free.pdf
    • https://s3.amazonaws.com/taguxif/mackie_mix8_compact_mixer_review.pdf
    • https://s3.amazonaws.com/lebejos/diary_entry_planning_sheet_ks2.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/34287185725.pdf
    • http://zapofekeba.rf.gd/80700566776.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/hindustani_film_video_song.pdf
    • https://s3.amazonaws.com/sojaxub/tera_crystal_fusion_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c759.bin
119e1ae7e28db448e11c8790b9766864d2d8f661ddaca3ac76271742db498cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 5568 bytes
font_01_sfnt_off0000da37.bin
fce0eb236c2a5a562ed7eabc4b9b49f0c8b13af84394f3330cc8ad4c994fa3f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 10084 bytes
font_02_sfnt_off0000fcc5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 4324 bytes

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