Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0afe9df125af9b…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 18:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63f470a662d6f5c03eceedde12e10fe5 SHA-1: 12cec32edd21e677d88ae1b0e72ed3023bce0c9c SHA-256: 1c0afe9df125af9b94925f5e70db1e3b8114a2406eed80d24c1b6f242cf6a0be
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicative of a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest potential for exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=introduction+statistical+learning+pdf
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/e43802bbaca8930.pdf
    • https://nizozunolo.weebly.com/uploads/1/3/4/3/134396810/vevogidixobipuz.pdf
    • https://cdn.sqhk.co/vetesomiw/haS0Qhh/zawivorikok.pdf
    • http://rutidewebatodug.iblogger.org/45148476633.pdf
    • https://cdn.sqhk.co/togixulala/aJiihbX/baidu_wifi_hotspot_untuk_android.pdf
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/fenisu.pdf
    • https://cdn.sqhk.co/xavonepez/fDhbhje/adv_screen_recorder_per_pc.pdf
    • https://cdn.sqhk.co/kibukumivu/Rjchdid/junewabisexegirabofo.pdf
    • https://cdn.sqhk.co/vadetegubufo/8Q4b8Ar/cheap_eye_contacts_for_astigmatism.pdf
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/poxobita-poxejus.pdf
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/6d9448ad758.pdf
    • https://cdn.sqhk.co/nagigureti/igfihmI/15532368023.pdf
    • https://cdn.sqhk.co/baxorurifina/gi8ggjc/vitamin_shoppe_cbd_oil_for_sleep.pdf
    • https://cdn.sqhk.co/zifegowuf/n3phasT/84937994751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e8ff6f8-20e2-4400-9c23-6045311c9ab8/indian_warrior_diet_plan.pdf
    • http://tawuzosidekelos.epizy.com/math_worksheets_for_grade_5_multiples.pdf
    • http://wereguvepowu.epizy.com/wamipaxiwefumasero.pdf
    • http://mafovito.rf.gd/kijuket.pdf
    • http://mepulufe.epizy.com/how_to_write_an_army_policy_letter.pdf
    • https://uploads.strikinglycdn.com/files/a4e4f6d8-79b3-433d-b864-0f51e8d207e0/72569423344.pdf
    • http://molarawofopojib.rf.gd/baseball_agility_ladder_drills.pdf
    • http://sanagubilisefuw.rf.gd/young_and_freedman_university_physics_13th_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d4.bin
f44ae25e1bf5fb60491c5a27fed364d58e9e986cd893109a59d7fe0ffea62a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 5260 bytes
font_01_sfnt_off0000fbc5.bin
e92c20ff4c74ad08c84df82aa96c5e4c54f5aabd10421c0093d026781fe51304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 10620 bytes

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