Malicious PDF — malware analysis report

Static analysis result for SHA-256 b703e3d828d801f5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 01:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd89c0bde6ccaa675781f339bbe6bddd SHA-1: e29a083e174cfeeb0665bd01ca4cf24cd85c05d4 SHA-256: b703e3d828d801f54780d7fe2d27bb1c1a359190c5ade54a1d62e7ebc5e32c89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nomylo.ru/uplcv?utm_term=tanpura+app+android PDF link annotation
    • https://zlato-stribro-investice.com/upload/files/tisifizosogutuseperebe.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/71242525421.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/23286476077.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/83948877706.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210903_7ABDA00D177D234B.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f2a47dcd2e5c22bf535e1921a5b4a5b3/71465060218.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bilirikajefisalu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137edaa492e9---muzaponibiravexudaligerak.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/41663258762.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/pebisonezoxidiwebizo.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/fovadamekusufodemezivobu.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/datiganigobijozajoxakegu.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/72444153512.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210905042210.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109030430094463.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kijupasikozowap.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/pitazofopegilexigowowegim.pdfIn PDF document text
    • http://freetds.net/userfiles/file/49690139537.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/zotefapotuwarizixusizom.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/26655091985.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/93703337331.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/86550527821.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10004 bytes
SHA-256: 86d5e96835773b0f422e07da7466393d9f1b12f6dcfd4371005cf631117fbb65
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 17864 bytes
SHA-256: bf3b3d768a51e58421d3620ea2d1548606e0c4d1fe47da2392b6ec23f539ea37
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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