Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a02dd5c4d2e924…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 18:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f03be9873e61c5bf4ace46d92bcfdaa SHA-1: 3a260fd439e106d314ccd703122d570719f5ba91 SHA-256: 91a02dd5c4d2e924085204e0023d4adf5d671b4f8de9b4ee52a179a3d39cc9b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=touch+vpn+old+version+premium+apk
    • http://cuanhuadanang.vn/uploads/image/files/piximomafuzugupok.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/lasawesexoporilexuponizi.pdf
    • https://dermatologie-francophone.com/userfiles/file/70601640755.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/dinowebezulijalemezopima.pdf
    • http://anhuicrew.com/upload_fck/file/2021-9-2/20210902175538996796.pdf
    • http://bbmeti.it/userfiles/files/tigugawukolejotuvoko.pdf
    • https://kcharp.com/ckfinder/userfiles/files/85068904929.pdf
    • http://www.icf-plant.com/files/file/mamuvazulegaligugaradise.pdf
    • http://erbaytag.com/resimler/files/fepovobififumov.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210911_C9D0437B019E3539.pdf
    • https://subded.org/userfiles/file/zasidujavumugu.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/jadilijobizizu.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/fezirumoveber.pdf
    • http://trips-in.com/ckupload/files/sifenokizimirofu.pdf
    • http://capesociety.ca/uploads/files/70311689661.pdf
    • https://igraonica.me/userfiles/file/govekexo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de488d2e49c2e79562d272c8306cdb42/bulasafibawuwiposusafe.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1fd491da7540d7e498cc5c4a4000dbc0/razuxedafiz.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/ralizebitanoxabupaku.pdf
    • https://leosservices.com/userfiles/file/44276081730.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dizirumito.pdf
    • http://shengnabei.com/uploadfile/file///2021090118083088.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae1.bin
2a2b1ac80842e0e21db78f8589afa67a12d055f9bffb5fae832f91b5fdb91bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 17552 bytes
font_01_sfnt_off00010889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 16792 bytes
font_02_sfnt_off000120a0.bin
b26713494f48df8e24f4e89089e9ee55b4abd2ec2142a3581369f4d902c820fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 10900 bytes

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