Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bec9a73ea06bb27…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 11:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 50a2640a00ab52ab91a0228b9336dca7 SHA-1: 594875bf079ec546613bec10db41b0c239d0f0d7 SHA-256: 1bec9a73ea06bb27458fa531037daa26e023532bb8fe919786bf41e48b19a0b0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely to obscure the ultimate destination or distribute further payloads. The document body is heavily obfuscated and appears to contain metadata related to its generation, rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=ean+jan-+13+font PDF link annotation
    • http://instapriz365.site/pewidojubum3wgf.pdfIn PDF document text
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/ba8979f6b32339.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/1d16c6df920.pdfIn PDF document text
    • http://getyourcredit.info/55873761431azjon.pdfIn PDF document text
    • http://tehnikator.ru/innova_3320_multimeter_user_manual2r8wb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fd8b94b23075.pdfIn PDF document text
    • https://mebopezik.weebly.com/uploads/1/3/4/7/134772208/pubebexajus_zenubot_kabiluneb.pdfIn PDF document text
    • http://leoidet.xyz/tufifesobadivunufimosygg.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/14164483283.pdfIn PDF document text
    • http://bnl-jobs.com/woniremuzajolopenufbpk.pdfIn PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/nadakeremudovofe.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/rigizaborusugifuvui35l9.pdfIn PDF document text
    • http://bumaga.bz/98127922069f7i1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_603c7e10ae7de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_600e881f0b853.pdfIn PDF document text
    • https://radofagomomixa.weebly.com/uploads/1/3/4/1/134132329/47461.pdfIn PDF document text
    • http://soldonlakewood.com/top_rated_shark_vacuum_2020fj39m.pdfIn PDF document text
    • http://chambrehq.xyz/a_dance_with_dragons_bran_chaptersj1c7o.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/6911783.pdfIn PDF document text
    • https://sokijaxojo.weebly.com/uploads/1/3/5/4/135400829/d61ff.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/frasario_inglese_commerciale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 4736 bytes
SHA-256: d6c95f59736626092fdb00687f01519b4162b4f5f7107727a0acabc42bdf6f2d
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10588 bytes
SHA-256: 53d38383c57bf0d70ed9c693ca7e0d15cb1bba97d30373ba02cec27d44aa6544
font_02_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 16084 bytes
SHA-256: a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978