Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39a18daef5b0241…

MALICIOUS

PDF

93.0 KB Created: 2021-07-16 17:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f76077c0d020233468f78fc0992a5f93 SHA-1: 71d5447690af79ad19b3c1b3802cc3e168b4a213 SHA-256: a39a18daef5b0241522c9e3b490e73c7456f5bce6292b8b615d53c33294094f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious domain, which is highly indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict. Although no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/square?utm_term=blood+products+and+plasma+substitutes+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edea8c37ddb5439bf837b4/1626204812895/patixojumowazivegolemo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda2200999c45203729f5b/1626186273022/91146427234.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7eb465eabb22f35db6065/1625811782184/classical_social_theory.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8237e9bae382bbac25177/1625826174563/35108502267.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f08f8707e59a06a5850973/1626378119460/natural_state_winning_numbers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ec9566be7e490f0d2416/1625877653412/walking_with_beasts_2.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7841314f92133d16efcc5/1625785363260/the_perks_of_being.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e920c4320dbd0de280fa02/1625891012289/drinking_games_with_a_deck_of_cards.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d29e64ce537163430e5/1626111273879/castle_crashers_pink_knight.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_off00010932.bin
d302f5bc171c9722299f7744a0a8037f8e56d94916efbe1e0895ba3f7b254c0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 11072 bytes
font_01_sfnt_off000122c3.bin
7fb9f6fd3c734bc367cbf9b6ab23d6c1e916c448a2720f4b42363ad1552d2914
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 16988 bytes
font_02_sfnt_off00014f53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F53 16792 bytes