Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1df71321b1de7…

MALICIOUS

PDF

84.6 KB Created: 2021-01-24 10:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 79ba0db04ca1b7f8cd9873e141539d20 SHA-1: 01bba132164d4ad3a48f327305afdec2bc361fb5 SHA-256: 84e1df71321b1de76c76acf07d11aca263d3559da8c6383bb41a98ac91528e5d
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to 'traffine.ru'. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest an attempt to redirect the user to phishing content, likely disguised as a document. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=the+human+web+mcneill+pdf In PDF document text
    • https://cdn.sqhk.co/ruxagoxoman/gggljd9/damaxapunobukefuv.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/ojcdhgg/wozeni.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/I4gf7zL/alphazero_vs_stockfish_all_games_pgn.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/blank_spelling_test_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/iekhdic/zusewalawowexeruvidi.pdfIn PDF document text
    • https://cdn.sqhk.co/zereseful/foLszhg/pac-_man_world_20th_anniversary_bin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fc69a47adc4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fc7b62e6bb10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501028/normal_5fe3de466dfe0.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/rfYgiEo/soccer_kicking_technique.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/iezFjfF/download_call_of_duty_mobile_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff25d0992d7c.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/Ry72ieN/saber_el_saldo_de_mi_tarjeta_visa.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/gOgjghb/tubasovig.pdfIn PDF document text
    • http://masonufidowex.iblogger.org/vorobidixuro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5ff589bed8ddc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lumixi/carrier_chiller_manual_30rb.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/gojujot.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/11757714094.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/liwow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 4992 bytes
SHA-256: d1491fa6dfa0b31184ecdc6c728171985c00a50b53f1e394d68e2afb1657cac0
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10544 bytes
SHA-256: 6131c3bdf8e1a08a330186d153019bf9719a467d5e6c50e295c7af79d4850e24
font_02_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3