Malicious PDF — malware analysis report

Static analysis result for SHA-256 910a2ba77b902701…

MALICIOUS

PDF

78.9 KB Created: 2021-10-04 21:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10bafa277d7e58d1ae3c8c6722ad91fa SHA-1: ee302418493753ad2bee9647d0fcf413a7c54ee8 SHA-256: 910a2ba77b902701220a868e56e2e7f2585981bdb4728827540abf3627844f2d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'cmd.com' in the document text, alongside URLs, suggests an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://museodegliarazzimarsala.com/userfiles/files/serovi.pdf In PDF document text
    • http://studiogalata.it/userfiles/files/19177632216.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/42495112021.pdfIn PDF document text
    • http://josquin-capella.de/download/bubofosexodoze.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/15964545305.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/46207982467.pdfIn PDF document text
    • http://qdcmd.com/data/files/79136571578.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/ridifafedikezigufumexilo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1e73o6jm3ojd8ld7t1ad7808s0/66474167322.pdfIn macro / runtime command snippet
    • http://sahrugs.com/userfiles/file/18535845483.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/59950617152.pdfIn PDF document text
    • http://mimpishio2bet.net/contents/files/81238181047.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/46981293613.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b4b026edecf71354958b6b323013386e/jurebejunifa.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/64860076405.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/67386694914.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/vazozokubideduj.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/59876757523.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/dawozinegopero.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/59612001913.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/38638200632.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/mesizeji.pdfIn PDF document text
    • http://stellarp.com/userfIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=job+objective+for+freshersPDF link annotation
    • 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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 10448 bytes
SHA-256: 62f503094c0a04961f68afc04b0f43de1b904630c6e104b4a5ff0b4639d317bf
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 17812 bytes
SHA-256: 8146567ed0edf80032def09e7e9b9af74e5e0ba1d2fcc9a6d36032c530a99a54
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1