Malicious PDF — malware analysis report

Static analysis result for SHA-256 b137b81a11359011…

MALICIOUS

PDF

85.5 KB Created: 2021-10-12 05:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4218006e4f49aa0f45fa2c8a3ad9263 SHA-1: ab9fe3c7b70420a48a5761a404eeb5a9cfbe79cc SHA-256: b137b81a11359011cb0f8bb3fcd55a469622ec7b333223cff0f5456ade19bf6e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or phishing lure. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hkalc.com/userfiles/97626102267.pdf
    • http://totoquynhhuong.com/upload/files/60557109825.pdf
    • http://thetestmag.com/userfiles/files/giruzomosutevaxonimubep.pdf
    • https://soechi.net/userfiles/file/17591556057.pdf
    • http://yuemeism.com/uploadfiles/files/janolikukubefot.pdf
    • http://salwex.hu/file/radakogopigavimiwuje.pdf
    • http://foto-recepty.sk/images/fotky/gulipanuzad.pdf
    • http://twapp.freshkon.com/upload/files/jagadusevipilolenuni.pdf
    • https://guruamardaspublicschool.com/userfiles/files/49988713879.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/75161782304.pdf
    • http://chanassociation.org/uploads/file/73078445513.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/gukuwex.pdf
    • https://fruitssupplier.com/app/webroot/img/files/teborubimigukewiwowowav.pdf
    • http://nifaelectronics.com/userfiles/file/rodetivot.pdf
    • http://saiprogetti.net/userfiles/files/sixajekipigot.pdf
    • https://preprodpcb.com/userfiles/files/fokilev.pdf
    • http://sacmacbook.net/userfiles/file/paxadanifobukonenomad.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/doflopa7if6u31cmflloo3214e/kufipu.pdf
    • http://vdi.vn/userfiles/file/96100203034.pdf
    • http://chanhungcorp.com/images/uploads/files/42915761456.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/disogaxu.pdf
    • http://sevvalturizm.com/rsm/files/fobibede.pdf
    • https://saikekanglun.com/filespath/files/20210907062519.pdf
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=kinetic+and+potential+energy+questions+and+answers
    • 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_off0000e6e0.bin
792a9e1cac528f659392ceb4a0805b0d853299d35253a28a22edd8e619af4b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 18036 bytes
font_01_sfnt_off000115e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 16792 bytes
font_02_sfnt_off00012df8.bin
2a2544d848e0cbe31650ee84c0251dc5d9fa796c5bf962b6daad4853220d2309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 11128 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.