Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37c3fb6d96004d9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 03:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71a3fad0b0621a40547b41879c20ed3a SHA-1: f1e76f2d46818197f2f47e6e8455dfe02643408d SHA-256: b37c3fb6d96004d9d806630c335373eafc78ff149dab33c5666223638812263f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=android+chrome+battery+drain PDF link annotation
    • http://kompassztuki.pl/Image/files/8283375689.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161382a30688ef---86865334267.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/17545720126.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/77665697915.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/85729306539.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/suladimedimilapatum.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/70923292341.pdfIn PDF document text
    • http://email-database.info/userfiles/file/mulerotubedusobebetajidu.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/sibajasowadefenabulexi.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/napobora.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/sotomejiwakegeruzusadupa.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/61092149281.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613644ecf25c6---92245491268.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210920171833.pdfIn PDF document text
    • http://videocycling.info/files/file/43736981659.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/43528433642.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/30675071504.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/lubegiguginorajol.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/61320602821.pdfIn PDF document text
    • https://sunrisemotelbellevue.com/nbloom/fckuploads/file/galasivalowogefakugam.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jamejukopipajepobob.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/25262465939.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/30419454464.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 10656 bytes
SHA-256: 2a6948adaf5127be3712e0e1f69a9a70fe6860ec7e32cd2e38efa569d4d29e40
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 18784 bytes
SHA-256: 8cfe73283d89efa81c120d092943353d66ef07611b2dda430c0a194f11975ae4
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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