Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6575579251b083…

MALICIOUS

PDF

71.6 KB Created: 2021-03-02 10:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9220f6876e4b5503fc53099f32edfc9d SHA-1: 56f8912c0eb98aa649e1bde436112e0d3fa5d5a6 SHA-256: fc6575579251b083af14ed834df4fbd20d19b8ad4b7db77ec0513950ea165430
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a non-clustered link farm on disposable hosting, reinforcing the phishing/malware lure interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=where+to+buy+petsafe+rfa-67+battery PDF link annotation
    • https://lomowurepiv.weebly.com/uploads/1/3/1/4/131437546/fegabirisuzemed-zorapo-banatutadamibad-gugel.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/iephhcA/contacts_icon_black.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/3DCElKU/trick_shots_billiards_clifton_park.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/8a01d382d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5fe0d8fd75877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_6028401811410.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/rufusanetizoj_malirujab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_60088a8947f43.pdfIn PDF document text
    • https://bevufivob.weebly.com/uploads/1/3/4/6/134669401/tofixunovozoxusu.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/Njajdha/nogutix.pdfIn PDF document text
    • http://cuzinfo.ru/meaning_of_the_idiom_full_steam_ahead54dbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_602ce6cddfa0a.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
    • http://fopajika.epizy.com/jump_force_deluxe_characters.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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 5208 bytes
SHA-256: 7595823cb92ea35960e67d25cf164b2c9d817d0353bd79670231aa3941c00b36
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10492 bytes
SHA-256: cf7ebc6c952f247d6e50a7a87787e40ac89545358964b53d5e425a72f28c93ec
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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