Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34f90bbe7049bb0…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 20:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3bc08dacebcebefb318a0341ac766367 SHA-1: 1af0791880891e2a1b7e93087dde9bef15163373 SHA-256: a34f90bbe7049bb05f2209d6413155a3b9fc7a0c07a4d7eca1151ba7ad6425bd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm hosted on disposable domains.

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
  • 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/123?utm_term=comment+install+android+sdk+linux PDF link annotation
    • https://cdn.sqhk.co/xuwadezab/Utgh3BT/red_vs_blue_wiki_caboose.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/xosaxufep.pdfIn PDF document text
    • http://jigofajun.22web.org/73134339343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_6051f6ac6aad3.pdfIn PDF document text
    • http://pobalulegofi.22web.org/32691093812.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/7873924325.pdfIn PDF document text
    • https://pajodiwid.weebly.com/uploads/1/3/0/9/130968992/88c7eadeee58.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/ggjkiiK/77341879936.pdfIn PDF document text
    • http://wawupamol.iblogger.org/badinerie_flute_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/jjogdnK/nolevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ffd71722cb98.pdfIn PDF document text
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/9373067.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/9839788.pdfIn PDF document text
    • http://rofaxemapup.iblogger.org/banixotilikus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevetozenirok.rf.gd/linear_z_wave_garage_door_opener_pairing.pdfIn PDF document text
    • http://nepupiborama.rf.gd/foderoruroxanexowez.pdfIn PDF document text
    • http://mabezaze.epizy.com/binomios_al_cubo_ejercicios.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/zopupa.pdfIn PDF document text
    • http://lavebaku.rf.gd/what_does_macbeth_symbolize.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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 5008 bytes
SHA-256: 3fa62c3480fb3400b3311893aff0296f10560e618f1c62c39e95e7a0947ff043
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 11608 bytes
SHA-256: 8e139a6e4c4954983df91d210f16c53dcfaac2253b2b122f5ea4990ed4971bff

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