Malicious PDF — malware analysis report

Static analysis result for SHA-256 af75ca8f8a333d06…

MALICIOUS

PDF

83.2 KB Created: 2021-03-27 11:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cdd52933cc88115bda28fad15a8d1c27 SHA-1: b1861aae4580f94c6eade27e1df7512da2496ef4 SHA-256: af75ca8f8a333d06edbb49cec97c6e477ecf5766191c56b402803f879bea8ef5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'bologen.ru' and containing a lure related to Android 10 updates for Sony phones. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=android+10+g%25C3%25BCncellemesi+alacak+sony+telefonlar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402718/normal_604ba939b58de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_602f2f2ea11b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_60515abdda791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5ffe9d47837eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5fdbd2a09454c.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/what_kind_of_pipe_is_used_for_exhaust.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ffa79fe2616e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5fe6329f83cdc.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/channel_master_9521a_antenna_rotator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_603d3b4c81196.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/similarities_between_andragogy_and_pedagogy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453891/normal_5fcd37d558f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_603c215da92ce.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/jurnal_bakteri_bacillus_subtilis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff64b061a534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/original_aramaic_bible_in_plain_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d0d51d-8139-4025-9c0d-a833d7c3cec4/potepajawiduloxolafumo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/pevekemejileju.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/48213441593.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/accident_reporting_centre_monte_principale_azilda_on.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/33305463414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9453ab45-3ebd-48f7-8c85-e69b7074fd3b/88613058796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0202f2-df72-4bb9-b5ce-cb81326809c0/is_power_steering_fluid_leak_dangerous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9eb45f-8715-4291-9256-61a5620d1306/ruleturikadaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/contour_map_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b15e97-3f60-4a95-b206-f39f3ced7d93/the_never_ending_road_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 3396 bytes
SHA-256: dc4d71ce285fdcd5cc190f2ac55ebe161f09300daf516bb9704fb6cb06182250
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 5812 bytes
SHA-256: b7e20fc0d2ac792e4dadae9214ee3f6e52c71042e8a0a080a24f1d1f990858e8
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 12472 bytes
SHA-256: 2313c6bd39b7fb31ad954c724f3ae6fcff1d57a5d4d922a774a710f95c5815fd