Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b625469cef1965…

MALICIOUS

PDF

65.9 KB Created: 2020-12-20 08:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2ad555016d36e55d43943b5b3d89d0bf SHA-1: 2438b4a05534a844b590565efea6de149838554f SHA-256: a5b625469cef1965d04772b724f5c3572729cb8e5e1549fa66f540ecb14ee8a0
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is highly suspicious. The document body, though heavily obfuscated, appears to contain text related to word lists, suggesting a lure for a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=noun+verb+adjective+adverb+form+list PDF link annotation
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/61e32b61f.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/siretinotirudisapag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5fb9be9cb079b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc66f4b08599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dabf270-49c6-4b3b-a56c-8200a1118db1/when_mr_pirzada_came_to_dine_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd33aa6-58a5-440f-904a-7afc404d4b18/zixoxobipizave.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/58122309755.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd546437a75c289d599510/t/5fde2646f23a830a59a13708/1608394311240/autonics_absolute_encoder.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68db56609fd0ee7b8a05a/t/5fd6e6cbe5ac58289635a512/1607919308294/9_app_apkpure.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bb2c88c99b6d37a6398e/t/5fc26d9d4f983757202e37ea/1606577566275/3355189999.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/18331322816.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc556d5df132613bbdb1115/t/5fc62da47acac6192a94bad0/1606823332574/rewilufefelobifujo.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/dpe_guidelines_on_payment_of_gratuity.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_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 5412 bytes
SHA-256: cbb347aacb6e03a34c743cf9817027a37644ffbc1741a2ff7ce375d695823db1
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 9916 bytes
SHA-256: 7288c5d8dc3df452058be19defd2def9846a48e7a8a359f1d38497eb680f8289

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