Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e94ff36e2ff1ab…

MALICIOUS

PDF

72.4 KB Created: 2021-01-30 23:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0cee7f18308d61d5bcaa74c34666a335 SHA-1: 888861600e60642f0c6fff52de03066980791a6d SHA-256: 42e94ff36e2ff1ab8ffa79476cc515168fbabf69c8f60562afae4202e679427a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational records, which is a common phishing tactic. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=sistema+educativo+nacional+boleta+de+calificaciones PDF link annotation
    • https://cdn.sqhk.co/pazaxefuma/hgidGhd/vapagatajexosegaj.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/haiciau/29217999605.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/hjGigc5/wexupofatoxodaxogoso.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/9IihkjS/cut_3d_model_for_printing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_6003e70dc3117.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/transcendental_meditation_mantras_lilgi0n.pdfIn PDF document text
    • http://am-sound.ru/collins_good_wood_jointstg173.pdfIn PDF document text
    • http://betmoy54.com/how_to_fill_screw_holes_in_wall_tilesjlg11.pdfIn PDF document text
    • https://cdn.sqhk.co/wepaxuwelusu/jcjdgce/59628470136.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/jtDhbpL/fatev.pdfIn PDF document text
    • http://save50.pro/bcsc_ophthalmology_free_download7cacg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumonufagatoteb.epizy.com/bounce_fabric_sheets_and_mice.pdfIn PDF document text
    • http://gedatedemokuju.epizy.com/bedediv.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 5372 bytes
SHA-256: 9d5ebf204df60b5838728ba85bd9107533f15b64598318e41f9250d025fa563e
font_01_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 11860 bytes
SHA-256: 9f3cdc9d6b1062498dfdabccfbddcaf246c309fd4dff618c498e43558996b388

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