Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b437f5b19e4ba53…

MALICIOUS

PDF

69.2 KB Created: 2020-12-22 10:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0653f622d75e3e581688bee5896ec4aa SHA-1: 1f02b66c1b5e2519a97bb3364dee9b8374425579 SHA-256: 1b437f5b19e4ba5331dea028c0e0cabf105054f4df44e8075fff7c3ca2a858ad
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution attempt. The presence of numerous external PDF links suggests a link farm used to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=another+word+for+barrier+or+hurdle
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/zulafadan.pdf
    • https://cdn-cms.f-static.net/uploads/4403561/normal_5f93f3272f91d.pdf
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5faeac257bb42.pdf
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/c7f6b9cb6c35f.pdf
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd63595b090d.pdf
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fbafce5afc34.pdf
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5fa3da077b3c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/subud/quantitative_seismic_interpretation_avseth.pdf
    • https://s3.amazonaws.com/gusaledikugumo/zabom.pdf
    • https://s3.amazonaws.com/kavitokolezub/koraxepozelituzil.pdf
    • https://s3.amazonaws.com/penale/birer.pdf
    • https://s3.amazonaws.com/vufuzewasi/zidumifa.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/xopebuvugixiboz.pdf
    • https://s3.amazonaws.com/wufujudisu/43530814442.pdf
    • https://s3.amazonaws.com/rerinago/bachelorette_full_movie_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69b.bin
78fd46dd18efd36bbb3983cdfb9a886561e5d0cbf76975036ffccb99f970a470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC69B 4920 bytes
font_01_sfnt_off0000d758.bin
137db75d7cae965b70dc445a77db82a709760d1cdce5eefa7af877f045a8841c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 10020 bytes
font_02_sfnt_off0000f98f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 4324 bytes

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