Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eeffd5014edab3c…

MALICIOUS

PDF

84.7 KB Created: 2021-03-27 21:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: adfb2229d4a9128cbb10784a204b2e1d SHA-1: 3d0f5e2f39208fedbd34f2d5af04807f27b8b70c SHA-256: 1eeffd5014edab3c63e2920e8a3bb3173443f937294edbacb4015581390cd550
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'xajibur.ru' and disguised with a UTM parameter suggesting a corporate profile. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, and ClamAV detected it as a phishing trojan. The presence of embedded JavaScript, though not explicitly detailed, is a common method for initiating malicious redirects or downloads from PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=advertising+agency+corporate+profile+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480749/normal_5fdcb53b4dd9d.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/0icieja/plague_inc_cure_mode_strategy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5ff7d20e89107.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/magaponazavi.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/concrete_and_abstract_nouns_worksheet_4th_grade.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/af740584028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_6039fb574dfeb.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/4813819.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/8882bfd4a6e4.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/159666d12.pdfIn PDF document text
    • https://xamelanaf.weebly.com/uploads/1/3/5/3/135331914/5857570.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/c5G7CaR/hit_song_lyrics_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5fe411077a882.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/31369872204.pdfIn PDF document text
    • http://espacecmb.xyz/wejevefuwofazazitufipevvcz3m.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/aa53627a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_600b3ea8340bc.pdfIn PDF document text
    • http://korecos.ru/bufuwazojewaxopafadegi0x44n.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 5260 bytes
SHA-256: 3e74de85ec47c4b5df772a63e9cbe53057bd7ddc99a1eb12985fa62f89dad6cc
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10552 bytes
SHA-256: 40b397d8f62540051dfd1a306cb47ec8126b78d4bd9dd2695cbf8480a5b36525
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 16128 bytes
SHA-256: d44d52ef66720e7299aa23375668eb807971917d9a72a2eac4a2c392e38f6666
font_03_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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