Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8d635f8ae85254…

MALICIOUS

PDF

82.1 KB Created: 2021-05-21 17:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3a7e2a06641af9a171e2003d09156a4b SHA-1: 94ca75c0e79e285357e7e0c6152e1fc4daa7c0d9 SHA-256: ea8d635f8ae85254516a6ccb0ea8dadfec3e742d326e4de8b4464e7b27b7b1ea
186 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URIs, with a primary suspicious URL pointing to 'xajibur.ru'. The PDF structure suggests it's designed to host a large number of links, likely to facilitate phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=cambridge+igcse+english+as+a+second+language+teacher%2527s+book+%2528fourth+edition%2529+pdf PDF link annotation
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/8663355.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/0f7105.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/sipije_medap_kesowageb.pdfIn PDF document text
    • https://nixixope.weebly.com/uploads/1/3/0/8/130874324/6738d427.pdfIn PDF document text
    • https://sidufuzijek.weebly.com/uploads/1/3/4/5/134598689/gavekujibilomuvoba.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/3201929.pdfIn PDF document text
    • https://derivasip.weebly.com/uploads/1/3/1/4/131407068/zekowajetigo_jebowave.pdfIn PDF document text
    • https://nugonerikol.weebly.com/uploads/1/3/4/8/134883066/godovonuximekadozed.pdfIn PDF document text
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/korerogif-vupuwarop-kixokare.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/2dd632b5-2934-42f9-b015-e1173e65878a/apush_causes_of_the_civil_war_dbq.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/nutupigafidezepeketusam.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/what_is_the_equation_for_finding_average_acceleration_for_straight-line_motion.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/agra_city_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88796863-d04e-4590-b1bb-ef17a10d7be7/watuwaruja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2cd741-b687-4389-ad1f-91949c05f686/does_air_purifier_filter_smoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c16ec0-3539-474e-866b-b03117630407/31841283771.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/image_processing_toolbox_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/59385663738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74b5211-5ff5-4dd4-9b66-6973d587b63f/30298595523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd14172-53a7-466b-8f68-6533762a57ea/lezajijodot.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/xomoleteneberubaxebezur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ab4193-758b-40a9-9025-9a83956f3e5e/fundamentals_of_biochemistry_5th_edition_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084823fe-f780-48af-9847-00b0618f9d19/lazosujujemulemip.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 3780 bytes
SHA-256: f3050d7d9c462f2fa9d9c2ee12ff3b946e404902cc277bc0e4d1547a18ad21c0
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 5864 bytes
SHA-256: 5e9207ea8d828bffd8fde83c0a0b87d9bd5c9353dedfddfc991c4f4ce01550e2
font_02_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 10684 bytes
SHA-256: efe05b5fd1a8c2499e5295a9552a4e670dbe2f422445c77a5b928110bc1179b1

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