Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7cf5ff0131e62c…

MALICIOUS

PDF

76.7 KB Created: 2020-12-28 14:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257b1bc31b900a874337103c20790e5b SHA-1: d301222818026610875a6f08cf7e458aa806c706 SHA-256: 1a7cf5ff0131e62c22052ca1d4bb41b916c496cf97ff78eaf7fd66822fd2fa00
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'vocal performance careers'. No scripts were extracted, but the presence of an external URI and the high confidence detection indicate a phishing attempt.

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://trafficel.ru/strik?utm_term=vocal+performance+careers
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fb53abba1fb4.pdf
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f9c8641aa64c.pdf
    • https://cdn.sqhk.co/tiwumixe/S6ECKSA/20529909936.pdf
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f8aa7b5448e5.pdf
    • https://cdn-cms.f-static.net/uploads/4487382/normal_5fb5b329c833a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/497b3f90-17fa-4196-b303-a9f073530b86/absorption_spectrum_example_sentence.pdf
    • https://s3.amazonaws.com/kasuwevovog/dinenofokuxoviseregexem.pdf
    • https://s3.amazonaws.com/lijopavexanuse/computer_science_igcse_revision_guide.pdf
    • https://uploads.strikinglycdn.com/files/60edb117-c914-4916-ad81-5dbc3f9add4b/gloucester_love_in_king_lear_quotes.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/identity_card_maker_free.pdf
    • https://s3.amazonaws.com/gadumagabusodel/phonics_short_vowel_sounds_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/df41b60f-5787-4e5b-a837-acff7e7ed845/wapitazomamakosop.pdf
    • https://uploads.strikinglycdn.com/files/581c947e-da29-4d2a-9a98-906d8a76604c/wewuperuxa.pdf
    • https://s3.amazonaws.com/wegemebufojafak/exo_mama_mp3.pdf
    • https://uploads.strikinglycdn.com/files/28828189-733e-4d88-8ca0-0ce4f81aeb83/49736740062.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fc.bin
2046b766a8691e40cff57e949425285decee96cb1ed0e58797fa619c1998cd3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 4788 bytes
font_01_sfnt_off0000f310.bin
3771b240963e3da542a9d435c3d32376be2180d6e4c4543ffbd028e67f738eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10868 bytes
font_02_sfnt_off000117fa.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 4324 bytes