Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d51de299a8b149…

MALICIOUS

PDF

78.8 KB Created: 2021-07-12 22:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528521a6dfb3cd018bbb931f19a33e5b SHA-1: d3495a30c81d7ebb14f4287eeecaa969251391ce SHA-256: f6d51de299a8b149ae90755f5b9ecac785c6504908d7779e492b3e2b91247d58
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a callback lure, prompting the user to call a phone number, which is a common tactic in tech-support scams. The embedded URL points to a domain that may be associated with malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9526

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
  • 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://crysiq.ru/square?utm_term=block+calls+from+unidentified+callers
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93231defa333328ab06bd/1625895473267/xixipogo.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e82495afd06e4982ed3d91/1625826453713/five_nights_at_freddys_ar_special_delivery_download_free.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e811dd5eabb22f35dcc96b/1625821661119/camera_on_omegle_not_working.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7a15b23621b4743e0e30a/1625792859844/55208622139.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e0590a287971af96a58a/1625874521629/24251104088.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec92df97282d6f46918d76/1626116831341/meaning_of_conscious_in_tagalog.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a758bb04542cee3828a/1626110581933/peppermill_casino_west_wendover_nv.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec84e5402743737596a24f/1626113253082/pevuxutez.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_off0000cf12.bin
9d2cc30e0e40954b08d7c5f0b23d59e5279ad3214f29306923dace062a86c238
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 17156 bytes
font_01_sfnt_off0000fc1f.bin
efe75b93e0c93da242c90b63565404c029905734185533dcdfe66a2f3fa8e0d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10884 bytes
font_02_sfnt_off00011553.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes