Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2400c98887437b2…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 15:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7d60f9492ddefd242e6c7ac587cb9ee SHA-1: e5e86ddfd250080677ac7ae7a7c76d33541aed4e SHA-256: a2400c98887437b23e7865ef6ca1f5da2ebcbd7e6991314dd582806d71ced839
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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to lure users to malicious sites.

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://lozipotod.ru/strik?utm_term=sony+rx100+iv+video+specs PDF link annotation
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/wegok.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/18009624764.pdfIn PDF document text
    • https://fudolimag.weebly.com/uploads/1/3/4/5/134586879/00887ffd669.pdfIn PDF document text
    • https://mimoleratamofip.weebly.com/uploads/1/3/4/5/134500060/86328.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/roxisatutodi_jiwudavez.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/cancer_de_cuello_uterino_monografia.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/what_is_the_bolt_pattern_on_a_2005_dodge_ram_1500.pdfIn PDF document text
    • https://duxosemizosew.weebly.com/uploads/1/3/4/7/134763313/76b6d85a0e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aab2e1b-b9c6-4e7d-afa8-f051b83e5042/xosomix.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_7af70a9ba5264764b99a4aa6a5ffa663.pdf?index=trueIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_65d27add611a41558971bea9c235d784.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ef8029-683a-4479-8cfd-3268cfd70571/ryobi_ss26_weed_eater_wont_stay_running.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfe007f-41b8-406e-8a7f-965cb43ecdd3/seth_material_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5aaab9-0b03-4c5c-8666-18fb6fd44521/94371993284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22be67f5-3ae4-42d4-8bf4-e5396204b2eb/how_to_find_the_slope_of_two_points_without_a_graph.pdfIn PDF document text
    • http://palibam.atwebpages.com/nespresso_capsules_catalogue.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/58819407617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221acb04-3101-4ea4-b050-2f9e67aed253/82585555593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848f614a-b640-4f84-a538-5601d4ebac9e/math_book_class_11.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_a44d38ea9e4b42799f6c4f18b4acdc29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91c53eb-6eb7-4d10-84ae-dc667a2460a4/does_the_swing_caddie_work_with_a_net.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be85f538-eb4b-45b2-9b1f-5a273edabf20/libro_intervencin_en_crisis_slaikeu.pdfIn 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_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 5352 bytes
SHA-256: 5ac11c66b21927cce9575837a7c154b3c69c76d2b1493130db9e1ccbdab7c7c8
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10528 bytes
SHA-256: 49efbbb08c28ae2192e13c1de835d166d1c67d706653068fe3dea3a8ac687159