Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a48882c56310cb7…

MALICIOUS

PDF

75.0 KB Created: 2021-06-12 19:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8509f08c5236c5a1b9f246c15d91b45b SHA-1: e319ef974dcaab2bb2e4248edcf1c355a22b8def SHA-256: 2a48882c56310cb785bba03aaeb47ddd8ae561de35daa9dd503359e03f13b8a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Siemens bms system manual' and 'wkhtmltopdf', suggesting a lure for users seeking technical documentation. The presence of an external URI pointing to 'midufefew.ru' strongly suggests the document is designed to redirect users to a malicious site or download further payloads.

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://midufefew.ru/123?utm_term=siemens+bms+system+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387704/normal_60640c607ec0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fce0e01ce032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_60b86c08b0a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fc7448c871a7.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/pawisule.pdfIn PDF document text
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/xajinusifevuxofinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojewalikar.pbworks.com/f/yepi_3_games_unblocked.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144500178/hotarubi_no_mori_e_english_sub_free_download.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/62858059236.pdfIn PDF document text
    • http://pevozowo.pbworks.com/w/file/fetch/144760275/gidivedovisezodepegug.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/nss_para_hilesi_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc647ab0-351e-4212-b371-e75c904fcf00/lijuwevasodobavatobatinor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db98f48a-5df2-448a-8c1a-9b924931223d/taurus_millennium_pt111_g2_size.pdfIn PDF document text
    • http://vatezerajigo.pbworks.com/f/94063188148.pdfIn PDF document text
    • http://murenet.pbworks.com/f/56031793378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf7d1cd-94a7-452f-b7b2-09d7ccc0e01a/dudenumomededogutiwex.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144454581/cursive_handwriting_practice_for_adults.pdfIn PDF document text
    • http://wemekojezum.pbworks.com/w/file/fetch/145151331/16844100014.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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 5080 bytes
SHA-256: 76b3a42e44d58d2901ebccdcd86526e2a19c9282d31de62e1b189451b7f548da
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10992 bytes
SHA-256: 6e35f5b756e523614fdaabc12c4f3283a3ef01777b66e53b0a3aee665a5d6f69

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