Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f15eb91e9875a5c…

MALICIOUS

PDF

69.2 KB Created: 2021-03-19 18:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf3c2b0724a539a02c90f6faf9697c4 SHA-1: b05eb21d039b3bbab52ff27a161d4827194a3ca1 SHA-256: 9f15eb91e9875a5ce66bc638af2df9909556b1943e016902f721fad3d28eaafc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/wix?keyword=chemquest+13+electron+configurations+answers
    • https://static.s123-cdn-static.com/uploads/4477635/normal_6000ef172e1bd.pdf
    • https://cdn.sqhk.co/rapigufagi/biiv8WD/gotifuv.pdf
    • https://cdn.sqhk.co/tefegegesuxe/bgjjyxm/does_amazon_music_unlimited_come_free_with_prime.pdf
    • https://cdn.sqhk.co/makubeku/54n5lia/mountain_climber_exercise_workout_routine.pdf
    • https://cdn.sqhk.co/nekuripafi/iLLjfUa/father_and_son_song_lyrics_with_guitar_chords.pdf
    • https://cdn-cms.f-static.net/uploads/4366306/normal_602b35ea9e56d.pdf
    • https://cdn.sqhk.co/bagadogod/zIiaIha/easy_brown_sugar_bubble_tea_recipe.pdf
    • https://cdn.sqhk.co/mukujoripu/jjif1ih/warship_legend_idle_rpg_redeem_code.pdf
    • https://cdn.sqhk.co/zarejesorufo/sehd1ji/mowikalololonebutota.pdf
    • https://cdn-cms.f-static.net/uploads/4426558/normal_5fdc2771629e1.pdf
    • https://cdn-cms.f-static.net/uploads/4488322/normal_602cb482ef99a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jakujakula/47082197423.pdf
    • https://s3.amazonaws.com/rafiralexezol/toron.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/android_games_to_improve_analytical_skills.pdf
    • https://s3.amazonaws.com/pasawexawinogad/59277503414.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_aae149ccb8814e999e8912006d26bb37.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_5ad0bb56b0f84996ae1806eee56d6873.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/is_one_punch_man_workout_effective.pdf
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_ab35b12ae5b2487f8e23379974ba0937.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc2.bin
15a402c5e9d6fa7efd75591f7a2c33adf678c264f3abc04b9812df2f67b80b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 5636 bytes
font_01_sfnt_off0000e2d7.bin
c145528af1c21095dfe6e39d3b61db94df88804a56194dbc58a9cff3ca89b77e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 10636 bytes

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