Malicious PDF — malware analysis report

Static analysis result for SHA-256 de27278c455b4506…

MALICIOUS

PDF

90.2 KB Created: 2021-03-10 07:38:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7831517ef95799f4a416f4408c535833 SHA-1: b5d2a4bc35cbb2423b63ef35eb311a0b917c1d8c SHA-256: de27278c455b45066726c29eff52184de43134ef460a9ec8bc3e28643eb40b43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=eberron+airship+names
    • http://mandarin-fruit.space/juzizenalijaxonoaunbe.pdf
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/fanesufevipane.pdf
    • http://balifruit.com/micro_vu_excel_52204xzu5.pdf
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/zidumuboj.pdf
    • http://support-copyrighthelpservice-about.com/6844397687098lub.pdf
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/2453251.pdf
    • http://atomyimperial.ru/mipapoxiramagusiwolimew3ivfz.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/ratakibiroranaw.pdf
    • http://copyrightreports.com/nikon_n90s_reviewgj0jk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_ad40ba9ba79546d496edd3dd74fb12fb.pdf?index=true
    • https://s3.amazonaws.com/guxosa/what_is_the_ideal_gas_constant_number.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_d71877aae8a149daba5efc043d3f8b2c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/000dc8fa-5a98-476e-8d99-3167dd5cfc96/76598499150.pdf
    • https://s3.amazonaws.com/litunux/what_are_barriers_to_effective_communication.pdf
    • https://s3.amazonaws.com/lunojol/jigopapaka.pdf
    • https://s3.amazonaws.com/rozebofukixus/raju_ji_name_ringtone.pdf
    • https://s3.amazonaws.com/feseni/votumonejabozivupegunobo.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_3ca2f2b4e0bd4f0ea7fcc861a929a1c4.pdf?index=true
    • https://s3.amazonaws.com/tufujifinobiro/ribiwuzitodinilopado.pdf
    • https://uploads.strikinglycdn.com/files/c2248be1-9458-400b-9ad9-bf831483bdeb/forgotten_fire_chapter_17_summary.pdf
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_9dde3282c4374e0c9af970d7dd2ee4ff.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_off00012747.bin
982118d6e6507ab62fb4ef918c7bd7cbb87f51fa96eb87900d88d0fbb1b06861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 5124 bytes
font_01_sfnt_off00013883.bin
0e8d92f228dc0d4fb59f37964e217488a1cdbce42e44b7e3997f0b4d2d63ec22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 10208 bytes

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