Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28c2b53594a356d…

MALICIOUS

PDF

75.1 KB Created: 2021-07-16 08:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fef13ec6401740047272979682985606 SHA-1: 3afce2f8fbbe95f1d60d5bb94e4b220517122f99 SHA-256: b28c2b53594a356dbe3c4fc7897f028f760b55092ca71a49a516738adf1d681c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The file is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It exhibits characteristics of a phishing lure, specifically requesting MFA confirmation or a callback for a billing issue, which aligns with credential harvesting or social engineering tactics. The presence of an external URI pointing to 'medvor.ru' suggests a potential command and control or redirection endpoint.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/square?utm_term=how+to+get+all+the+answers+right+on+achieve+3000
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec846d7a1add4dee1f983a/1626113133094/wowefimejetediselinogim.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f10c28f32be22f007594b3/1626410024290/asparagine_one_letter.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edd2483e0111437126dbf4/1626198600418/57281173111.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0d4c1133357608f37e792/1626395841349/nenozukiwuwuxiti.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edde5d670c344ea75d0d98/1626201693713/21251855414.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e812b446a8e17713e6e2ef/1625821876428/hiit_workout_for_belly_fat.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f09db757cc372dd8b4860e/1626381751369/zosagepofumelogemixurizo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0e457d1fa142bceaca176/1626399831601/eliminator_battery_charger_manual.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_off0000c3f3.bin
357c9d488749490afa502af5e37c47c3f785d9036bd14d7a31d532c4642fe0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 16412 bytes
font_01_sfnt_off0000ee80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
font_02_sfnt_off00010697.bin
6ce16ca54e632c44a9cc0f9b973e59387325954a0f2dfe78942d0a66536b108f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10944 bytes

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