Malicious PDF — malware analysis report

Static analysis result for SHA-256 8731fd8b34bba109…

MALICIOUS

PDF

89.3 KB Created: 2021-03-28 01:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e70302c52d54f7c0d6f499ea771f75e4 SHA-1: 3ce5cb64daf31ea15abe94ed0bf82c36fabc8758 SHA-256: 8731fd8b34bba1090230078827ec7ed61f4229b898dc4f58b23808d6f383985b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+much+is+a+viking+refrigerator In PDF document text
    • http://mirijesuwakug.sportsontheweb.net/liquidos_isotonicos_hipotonicos_e_hipertonicos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_60059b65ee3cf.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/hgD7hhj/kudelad.pdfIn PDF document text
    • http://crystal-light33.ru/22342887845490vx.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/instrumentation_engineering_books_free_download.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/rodide.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/tetez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_6049218329c7e.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/10_tricky_interview_questions_answers.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/radox_bajevumexe.pdfIn PDF document text
    • http://digitalcalakk1.xyz/vepidunowobepuxexamuwa0z.pdfIn PDF document text
    • http://changely.club/6421847646425j3r.pdfIn PDF document text
    • http://cabinetshub.xyz/how_to_use_a_jack_lalanne_power_juicer0m88p.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/bFsDsjc/14539556452.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/gjQDdzb/tisiwelenipesuv.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/3c6d9318-4e43-4485-8075-48437cc53c31/tetirezisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a415e03-b2c8-4af1-810e-bbc8a7014b30/what_is_hyperbole_and_give_5_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808abbcd-2795-4296-82b0-cfa6d63c228b/what_does_a_foggy_fish_tank_mean.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_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 5440 bytes
SHA-256: 64a0eeb978c10d957869112197ff3655a31718256e3c8cc56cffd7cd6daec229
font_01_sfnt_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 10836 bytes
SHA-256: 3e3bb666623fa491bb60a872e98ec93f81b68da642d5b09ce0275533b18cc3b6