Malicious PDF — malware analysis report

Static analysis result for SHA-256 05341aa3e6b56d09…

MALICIOUS

PDF

69.6 KB Created: 2021-03-02 21:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 080661b37768cf1bc8ed494322187172 SHA-1: 465743033cd955c507a9227d08f8472b5b988f6a SHA-256: 05341aa3e6b56d09668b44f2a2b6dd7e1a4ba03e2ad07c24f2135bcf270df85e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary suspicious URL being https://baarspo.ru/wix?keyword=congruent+figures+worksheet+6th+grade. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the presence of multiple external URIs and the overall structure suggest a phishing or malware distribution attempt.

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://baarspo.ru/wix?keyword=congruent+figures+worksheet+6th+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc93ab9a53bf.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/9263617.pdfIn PDF document text
    • http://lasleymarkt.ru/gigewijeviladogagezigolebee4v.pdfIn PDF document text
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/kajafolizunab.pdfIn PDF document text
    • http://letgtma.bid/xotamevifixukeguwitastvfkd.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/1jiQjBD/80560144131.pdfIn PDF document text
    • http://probkin34.xyz/19212595542fqv3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_602814f37203b.pdfIn PDF document text
    • http://shop50off.info/blood_bowl_2_show_tackle_zonesq61i4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489035/normal_60020358b18b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_6017c4bded419.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/nasibiteg-koronerufas-badewiwinuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/K3idSjc/fofegerulururad.pdfIn PDF document text
    • https://xibijogoxedugo.weebly.com/uploads/1/3/4/6/134662411/rikelazik-taxuxuga-mulukepun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/free_personal_letterhead_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/29827990537.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/unix_vi_commands_cheat_sheet.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_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 5352 bytes
SHA-256: eded28076bec568c632587a8e82e392c5105ae94c61e326e447d7323f1ea2674
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10208 bytes
SHA-256: b3ab725c1ec4f7e3b7b72bf351ca1b50273d350e9093c5c0cccd3d8c1d69bf3b

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