Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce5ef8596680978…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 23:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c1b4ef0cfdfe54c56dc63af4f1668f SHA-1: 978ebe0f39af6e8b9475f000772aa9c7ffb47fc2 SHA-256: 9ce5ef8596680978609845abebc5981b32e72a3cdc13a51dbdbae6b579dafe0b
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, flagged by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs and the nature of the heuristics indicate a malicious document likely intended to redirect users to malicious sites or download further payloads.

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://dafemum.ru/123?utm_term=beatles+complete+piano+edition+pdf
    • http://visiblawty.com/a_christmas_carol_text_easy_reader5vrj3.pdf
    • http://about-igsupport.com/8121054882cazbl.pdf
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/botofupabara_tekuxeduzimuze_fetiwugedusevu_zidura.pdf
    • https://pulosonimoge.weebly.com/uploads/1/3/0/7/130739093/3455830.pdf
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/togewujunitefemos.pdf
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/fazakavomef.pdf
    • http://zeropium.com/food_list_acidic_alkalinetsva1.pdf
    • http://generatorsale.ru/company_safety_plan7x0sn.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/3a770dff1.pdf
    • http://sadovik.me/how_to_do_shadow_puppets_easytjj1i.pdf
    • http://beamorem.com/96522235688u5y04.pdf
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/kopazok.pdf
    • https://xugeragerowet.weebly.com/uploads/1/3/4/6/134641260/kujol.pdf
    • http://toppiksnack.xyz/tibusasm0qx.pdf
    • http://legendnat.space/market_wizards_series_by_jack_schwagerz9a90.pdf
    • http://itdiscounts.pro/50753626824fvmda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/614b5894-fe85-4f77-a47e-2452523c1c70/liver_detox_diet_foods.pdf
    • http://mewabetowa.myartsonline.com/28009954754.pdf
    • https://uploads.strikinglycdn.com/files/2388a27a-7980-4af6-b316-4395b6333851/valence_electrons_and_ions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/8bc96659-91cb-45bb-a714-05b2e327926b/37549136142.pdf
    • https://uploads.strikinglycdn.com/files/2f004631-71c9-4eeb-bbce-3f7b72b5be15/91024433138.pdf
    • http://wobanunep.myartsonline.com/how_to_use_a_commercial_electric_digital_multimeter_mas830b.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_off0000e8c8.bin
6f11219178997b925772e5caa3b1a77db6885428723b5b12a28fa213235208d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5256 bytes
font_01_sfnt_off0000fa9d.bin
1b0a4d3c800575ef6a3d5f0cb27d29ad1c0b1915d60067458c79b47f76a69332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 11888 bytes

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