Malicious PDF — malware analysis report

Static analysis result for SHA-256 185baa0cea35e3f4…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 21:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 011b7817ace1076984183563e9063ba3 SHA-1: 122dc2c17e50f11e439bc9079b0f3ec819a27ace SHA-256: 185baa0cea35e3f4d103866672ab41ae2ab3bef867470ef8adac90954a59cb59
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm containing a large number of external links to other PDFs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's primary function appears to be redirecting users to a network of potentially malicious or SEO-manipulating content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cdn-cms.f-static.net/uploads/4412183/normal_60467b12714e1.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_6041d22f2cc43.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/sig_p226_rail_light.pdfIn PDF document text
    • https://dimitosakusefix.weebly.com/uploads/1/3/4/6/134631941/1407642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_60655cc035d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_6021c9949d291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_5fd1c01777a55.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/jogowaziden-laxixedajeba-rajalizomarolo-zajavi.pdfIn PDF document text
    • https://tazusovekofuwaj.weebly.com/uploads/1/3/5/9/135969448/2273780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=what%20stars%20are%20in%20the%20night%20sky%20tonightPDF link annotation
    • https://s3.amazonaws.com/woberiz/tisogugijerosiko.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/67169656345.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/how_to_clean_hp_photosmart_7520_printhead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf6dfe8-ab8e-43ca-83f6-d9d1248f5673/rikeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38da9e53-4df0-4ffc-aca6-1dbda30ada5c/sentence_structure_checker_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/vavetoburesizifalelepi.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/verizon_lg_flip_phone_sim_card_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4d06d8-2b3f-46fb-8d71-3b8222009f8a/49707848807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d7fddf-5680-407f-b618-6e0481a5f5f8/94673535214.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/89622914725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c71a357-2475-403a-9e8f-21574213729b/how_to_calculate_battery_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/camcorder_camera_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8cb586-ee86-4ccd-90e1-69003c0c12c5/59006883621.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_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 5092 bytes
SHA-256: ec20d5c57404e50200ff7349956344ebebb9f4fbaea7c506ac6dd0f1e940c095
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10972 bytes
SHA-256: cdf0e2ca4eea86b3fb368248d6105a0bd8d8b2bddd3d9a689590377b5056fdcc