Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b5159452f8e901…

MALICIOUS

PDF

79.2 KB Created: 2021-04-27 04:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3f5c8be62bb98170b2a482121b7b1796 SHA-1: b82c388091013a01e828bfc8026fe09a81896dbd SHA-256: b7b5159452f8e9013d11b0800c617cc066a6eb85f6d45cf541c2d5f1c4656628
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a URL with a 'utm_term' parameter further supports a campaign-driven lure. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=kenmore+600+series+washer+drain+pump PDF link annotation
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/85870.pdfIn PDF document text
    • http://salimom.mygamesonline.org/html_to_c_free_library.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/8485584.pdfIn PDF document text
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/bc124.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/86080866651.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/a976431c3b7aa.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/sebiganititoka_tadabozutekarip.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/sarufimoxirifikabe.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/how_do_i_fix_my_verizon_red_globe_router.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/90680100049.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/how_to_speak_american_english_like_a_native_speaker.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/gazedadevisidi.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/modexojegil-xofobalevugur-jatup-guwajaxet.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/83cf25db-ce06-47b5-be28-2f1c417b6241/how_to_redline_in_adobe_acrobat_pro_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18924eca-73f0-4029-9a57-ea4ac5e4e7c1/pukoxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f5648b-c69f-41fe-8e0d-6444dd269b10/mirepufegaguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95367fc-47d9-43d2-b4c5-5b75848ad860/what_policies_are_required_by_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779c5b32-6b52-4d58-af29-b3552c2a3010/shimano_ewwu111_di2_wireless_transmitter_unit_-_ew-wu111_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebab9886-34e2-45b8-a0f0-64643e5306a5/17_laws_of_teamwork_list.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5524 bytes
SHA-256: 366280edf36e0d6adf759dec8f32d0b8b04b326d0677fa8ca0a3ed21e21010a6
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 11396 bytes
SHA-256: e6a3d52db9e22c162dd6ca3277baab250dcfd6548a5e3e330f982e3d64805162