Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13baec7fabea21f…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 20:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 160b770011fd81136dd1eedadaa0f2ae SHA-1: 49417d3f3002092392fef6b537101f6f0a0d78fb SHA-256: d13baec7fabea21fa50df9d12c7cfe91d1c4f111e2f7e3b3bdf2f6ecb8fdb20a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/wix?keyword=confucius+analects+worksheet PDF link annotation
    • https://cdn.sqhk.co/pivokazi/jqijij7/among_us_map_for_minecraft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392647/normal_5fec76998cfb4.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/ijhvMij/skateboard_tricks_to_do_before_ollie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fca8ec4c637f.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/jobQHid/basketball_legends_halloween_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/aqmx7PZ/91678858848.pdfIn PDF document text
    • http://viwimewi.22web.org/mitsubishi_1080_hd_projection_tv_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/komifugu/rjficJA/scary_clown_horror_game_adventure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_601830094200e.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/lhfvi0r/halloween_face_mask_design_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/UAxYz8n/41646347662.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://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_765123918a0a4b2a9f4c434387b6a5a4.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_655b0fbc92604c079a1715219a715732.pdf?index=trueIn PDF document text
    • http://fisejotigu.epizy.com/acute_glomerulonephritis.pdfIn PDF document text
    • http://bakajejupuxa.epizy.com/they_say_i_say_gerald_graff_and_cathy_birkenstein.pdfIn PDF document text
    • http://fezurerejexi.rf.gd/rugigepezerinuxivax.pdfIn PDF document text
    • http://kiwajuku.epizy.com/lofelozabidejopa.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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 5032 bytes
SHA-256: 58a784920cb020da49a6d7b2ba9d0597915d75cbbe222d58cc13a3c9eb0e5300
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10284 bytes
SHA-256: 4797301647c92bf00570ad0f5bab286a0ce4b2cd7e3f6b1380663bea075c864a
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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