Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20d7e26a86408c0…

MALICIOUS

PDF

74.2 KB Created: 2021-02-03 03:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7fb5bfed7b37439b28b4adf18d6bf902 SHA-1: b5898e6425e0a938152fda0d5d098f7b5f63efca SHA-256: f20d7e26a86408c03440dcd959fcdec52cfad1649d7aea71631127094cbbdaa6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=letter+of+recommendation+from+a+coach+sample PDF link annotation
    • http://pornbustyvids.com/fevudogoruriginov8w57t.pdfIn PDF document text
    • http://idealicait.site/road_traffic_conditions_scotlandtzvot.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/2fb28d228667.pdfIn PDF document text
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/sozijov.pdfIn PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/4705437.pdfIn PDF document text
    • http://banquepopulaire-fr.org/wenijadonifufanev8ntf3.pdfIn PDF document text
    • https://mitafomanamo.weebly.com/uploads/1/3/0/9/130969747/841bc18b135c7.pdfIn PDF document text
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/sevakavebe.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/gomugamebuvepunebi.pdfIn PDF document text
    • https://buwumesuja.weebly.com/uploads/1/3/5/3/135303403/120584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifumupesa.rf.gd/11249573972.pdfIn PDF document text
    • http://wobemiko.epizy.com/jugemufagefogawi.pdfIn PDF document text
    • http://pijularof.epizy.com/ap_grama_sachivalayam_anm_hall_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/pijokopagijevapidibodux.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/wutasekajovetatevegerek.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/conclusion_of_internship_report_of_hotel.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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5336 bytes
SHA-256: 25838cfa7a08b77e36ea85fd3d0c7ea21f95b3dbc83d5f31a55975e36c514043
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 10348 bytes
SHA-256: 0a7eecc05b7973456962716f7c07c2a715de6498eadf857a24254d7dd92b4cb5

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