Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb18e6f8281cc8e…

MALICIOUS

PDF

73.7 KB Created: 2021-04-14 09:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f63a332423d799215d58924ec5ccc1a SHA-1: c561c0176607bef0b088f3db1f7b6f6eb0fb2329 SHA-256: afb18e6f8281cc8e1ca3992a0bd8c3c46317ad83759fa1d69b0796b81f07d94b
186 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=hvac+fundamentals+pdf+ashrae PDF link annotation
    • http://zonuvak.medianewsonline.com/fibine.pdfIn PDF document text
    • http://teleporttur.ru/tisadadagusesnn9pl.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/amplified_pain_syndrome.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/gubalaguk.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/wazifufubizub.pdfIn PDF document text
    • http://carins.info/fly_tying_bench_for_sale_ukb79sb.pdfIn PDF document text
    • https://liwarelavoz.weebly.com/uploads/1/3/5/3/135398493/lidokumakodike_suverolewa_zupusosisiwunov_zolalupudis.pdfIn PDF document text
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/1343210.pdfIn PDF document text
    • https://dokivubugu.weebly.com/uploads/1/3/4/6/134688884/ea2f835a6c2ae3.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/wobugeso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_a23496e801fc4cb591cb19fc600ca3e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71682a39-8248-4c63-9aa8-113363b02cd3/goin_postal_hours_of_operation.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_993bfde283a3493abdb7e51165b020b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/which_exercise_is_best_for_high_bp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7474920-31f0-4234-82b3-d921270be95d/zodenutawafezavevibe.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/navarre_bible_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960438d0-811c-44d8-af19-9c9ab31912e7/the_book_thief_by_markus_zusak_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/what_is_a_passing_score_on_the_aphr_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f65703-4da6-434c-a450-e8ce8e4835a5/20327664113.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/52333802317.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5416 bytes
SHA-256: 13dc51563372f5ef867a9574efefef172625c185827b76229ef9a53838868d75
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 11196 bytes
SHA-256: 33f3a1292ebda81410da665e68b45a697650b230810fb605d12a86f27a7eae35