Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52aa35fbbc510ff…

MALICIOUS

PDF

75.1 KB Created: 2021-01-12 12:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4fc326ad7998ca69eb2e60be49929d38 SHA-1: 3e2c9ee0c52c0049a61b5be4f8c6aefb0176abba SHA-256: e52aa35fbbc510ffbf80bc8dcd9a4071c1a90c2b03c947cce3b2bddece7c42f3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=intimate+apparel+by+lynn+nottage+pdf PDF link annotation
    • https://cdn.sqhk.co/gimexigerub/cRjajhc/king_kaiju_arena_ark.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/3082911.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/bieiehc/stick_ninja_fight_legendary_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/KgeHH82/woman_surfer_shark_attack_movie.pdfIn PDF document text
    • https://site-1178332.mozfiles.com/files/1178332/56851808131.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/3537728.pdfIn PDF document text
    • https://cdn.sqhk.co/fipexuwebo/R1J4tax/dino_race_timer.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/igYLt48/wedding_salon_2_libii_games.pdfIn PDF document text
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/4381483.pdfIn PDF document text
    • https://site-1245311.mozfiles.com/files/1245311/88840052087.pdfIn PDF document text
    • https://cdn.sqhk.co/pukojawutev/fjaiaL0/kingdom_new_lands_how_does_the_banker_work.pdfIn PDF document text
    • https://nonokutofukidob.weebly.com/uploads/1/3/4/8/134872148/8583312.pdfIn PDF document text
    • https://site-1177025.mozfiles.com/files/1177025/real_classifieds_buy_and_sell.pdfIn PDF document text
    • https://site-1175796.mozfiles.com/files/1175796/light_up_reindeer_and_sleigh.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/2xa6hd8/live_skull_wallpaper_for_iphone.pdfIn PDF document text
    • https://site-1177815.mozfiles.com/files/1177815/lukegukuvilomabuge.pdfIn PDF document text
    • https://losikopak.weebly.com/uploads/1/3/4/6/134616488/nigazigazawafazubar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 5364 bytes
SHA-256: 4b0e87e3a5fc1ea39b6358491e019a8338a58318ce391e8cb8cc2b6d00219480
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10480 bytes
SHA-256: 478ac3b631ba39e7d8d3879ddd4e28e856a924e6c094b4d33b6ac384e255b0bd

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