Malicious PDF — malware analysis report

Static analysis result for SHA-256 5049fc4bb61d7560…

MALICIOUS

PDF

68.4 KB Created: 2021-03-10 03:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 039b9629c3fc056caaabb6d0491afa32 SHA-1: 26bbaca15837d1177b5ead058319b67ded0d8704 SHA-256: 5049fc4bb61d7560c06e3bc0d2361159e07e9eb50e110cfeb68224521f9d2b84
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including suspicious domains like xezojetit.ru and show-visitor.xyz. The document body, though partially corrupted, contains keywords related to a gas grill, suggesting a lure to disguise the malicious links.

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://xezojetit.ru/strik?utm_term=char-broil+plancha+verano+200+gas-grill PDF link annotation
    • http://show-visitor.xyz/suvixurigig.pdfIn PDF document text
    • http://parralax.net/3ds_rosalina_guidet6f1r.pdfIn PDF document text
    • http://uscreditinquiry.info/nelemedouidg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5ff9afc9e1d88.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/gjaifK7/68446980554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_60141251b8d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5fe0611d632e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6010dda72d63c.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/qiakZrB/mp3_player_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_5fd81b4908e7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5fe4f7c0a9d25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fff7816dbff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_601b64e84ac67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redepigupemon.rf.gd/1709397111.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/59582271489.pdfIn PDF document text
    • http://naxadib.rf.gd/budgeting_spreadsheet_dave_ramsey.pdfIn PDF document text
    • http://golofup.rf.gd/how_to_make_a_robe_out_of_a_blanket_without_cutting.pdfIn PDF document text
    • http://kawobos.rf.gd/95192559352.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/lukugozipizelapurog.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/32917570073.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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 5608 bytes
SHA-256: 71343f943bfc3012162da4b0144a62ddaa98e09194d944804282b3ec58dde0b8
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10144 bytes
SHA-256: d94a25cda26f42d0d65cba30b0e4645bad1a4d2ca1d7a3ed26e344ef801afb22

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