Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60a7d799090d8d2…

MALICIOUS

PDF

70.6 KB Created: 2021-03-17 21:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 50ec568faf0b898c0e4ba8154bfe6d55 SHA-1: 508118986885c3fed1df4f085a6b50cce94f2697 SHA-256: a60a7d799090d8d2aef6bab4b85fb0bbf805feaf6aea75a843a65359ef3877a9
186 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 point to disposable hosting or suspicious domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=digital+computer+electronics+book+pdf PDF link annotation
    • http://afterdealer.pro/the_little_prince_first_paragraphemslf.pdfIn PDF document text
    • http://sovetnik53.ru/blackshot_hack_2019vfa3g.pdfIn PDF document text
    • http://therarbooks.com/baseball_star_mod_apk_ios864p9.pdfIn PDF document text
    • http://instapriz24.online/nevubevakepawq8q7c.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/sole_elliptical_e95_reviewsbwv3s.pdfIn PDF document text
    • http://shop-profildoors.ru/97497421595nqyg3.pdfIn PDF document text
    • http://timecodes.net/mexil4i39s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_b5838fa4bfaf4fd0abe64b8ee3a11595.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_a95d0ee56926491cae8d38fc25e8c9f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbff8bc-de37-4cda-9cc9-7235894218f3/is_les_mis_on_netflix_2020.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_b472292f9f9145d8ac539c6b95e4e83f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0356eec2-5cce-4122-b4f4-b3e5a8804cf6/34689603770.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_1150af5f6d1247e0a042b8dd8da56eef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/muxazimaxujapefa.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_59f0971e26134fd396a89fa15b9da0ca.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_59f0d804f2ce4d158b35b02ddd8f6ef1.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_a8a0100e498944148d5a75d2f638a9c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/243e580d-3ce8-49c6-be0f-6e7ca0dbb821/19553150545.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/albion_online_fishing_guide_2019.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_2b4bd069c0964cdebd514e1a888156cc.pdf?index=trueIn 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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 5680 bytes
SHA-256: 75a4625c6c5599491bd8cceb9504e29a1ec2ba8d1b54968a95800d605588fa5c
font_01_sfnt_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 11068 bytes
SHA-256: e041d0f34ea224c2d97fe9205d766241c191c13e3f88607f3e040304fd1d371f