Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd0f930acd76c1d…

MALICIOUS

PDF

99.0 KB Created: 2021-07-12 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a7c259e720fa5eb93d60751153b065e SHA-1: acd20ae118c5d2350ef5f78a4116e150a1241909 SHA-256: 5fd0f930acd76c1d3d3eb19df035cb058ee347635ace2118f0f187eceaf0a027
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'nomylo.ru', which is likely part of a lure to trick users into downloading further malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/square?utm_term=confederacy+of+dunces+pdf+free+download
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec78c667baa26076baabf7/1626110150475/strength_of_materials_notes_for_diploma_civil_engineering.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8ce43a7a95e0b197fff8c/1625869892098/connecting_pentatonic_scales.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8616844497c3ffe66f6e8/1625842024348/how_to_delete_a_line_in.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d18fa5e1975eb392c592/1625870735292/how_about_a_writing_a_good_research_title.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7b2498f757b1ac44f51f5/1625797193984/10_things_i_hate_about_you_dance_song.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec77e2154eb17b6848dadc/1626109922500/without_god_i_could_do_nothing_hymn.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7c4a87be683581ce1828f/1625801896470/watch_annabelle_comes_home_123.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7ad7fe047727940aaea0/1626110679225/difamo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7add3a853d606aeb83d9/1626110685391/fecal_transplant_meaning.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94015563c1506a8b71b8b/1625899029297/are_there_we_go.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_off00011f38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
font_01_sfnt_off0001374f.bin
57011f9d3c445aecc52a03c75bc253f856d0d01954024bb1f442b9dc12465f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x1374F 10752 bytes
font_02_sfnt_off00015047.bin
62b09ce97b2c976c9be2af84b176976d3a427fb754a28be4928d82c8c7d57ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 17312 bytes