Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bb43364f862efd…

MALICIOUS

PDF

76.7 KB Created: 2021-06-11 13:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f856efb76eee85c32908a3f6a8b8f545 SHA-1: 885d6da7564666106e4280d2726619837146e050 SHA-256: 87bb43364f862efd810bdb5db6e90c0fbc88e3be5d5d60abe7a7512d44f9b428
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 0.9995

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://smidgel.ru/pbw?utm_term=double+dash+rom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412775/normal_605d62740eb19.pdfIn PDF document text
    • https://rakiletapaleta.weebly.com/uploads/1/3/1/8/131856645/8f50b25ef2747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fe42f1d071fd.pdfIn PDF document text
    • https://wilalunawotepa.weebly.com/uploads/1/3/4/6/134608105/vewopel.pdfIn PDF document text
    • https://jojumevowe.weebly.com/uploads/1/3/4/3/134314985/4625927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600c7a6fd9fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_600c755acc9d2.pdfIn PDF document text
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/zopizaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5fc641003f68c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosezoranad.pbworks.com/f/how_to_change_gears_in_a_manual_car.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413199/nusibevudodebuxetoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d639c73c-e204-4cb4-974a-d1b984d88241/5_levels_of_leadership_full_book.pdfIn PDF document text
    • http://pikalunik.pbworks.com/f/college_pore_ek_maiya_dj_mp3_song_download.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/73033875401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b28bff3-3932-4bc5-9183-60a23c26da96/57250464442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f02e40e-bf07-4be8-b7f4-cd104ebebb30/14857640114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effa966a-a6c2-4677-85d5-dec9b9c8a783/dugimozo.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/the_passion_translation_new_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bcc1e3-9e49-4f5a-b889-ab0015efd16f/how_to_use_bosch_300_series_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cddbab6-8a3d-444c-9c51-8d02d3e5ae7b/blue_moon_tavern_pbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06efd342-ad95-4ff3-bdf7-16044b6e806f/jepudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9baf0231-d6ec-4f55-816d-f39865f6967e/kigenitowalovubemazisigiw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5204 bytes
SHA-256: ecfeef0b30989ba42ae49fb8f0bc6895ff5fb765828df552bb3299312ddc3c60
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 11824 bytes
SHA-256: 5e3fca10c8f0149272a6d6858020ff2dd4b875a3d4460925df41874e066dc5c7
font_02_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2