Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb9b9ac0527c962…

MALICIOUS

PDF

97.2 KB Created: 2021-03-24 22:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a4187be40f990276962c9bae8458d374 SHA-1: 20aca4d386a9f758e98c195918265fb99e0af8e9 SHA-256: efb9b9ac0527c962bd9a17b1769a5b701ccdb0de52c21782f354a239f665f117
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=the+lost+mariner+xena PDF link annotation
    • https://xajekedifa.weebly.com/uploads/1/3/4/4/134469171/2228670.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/icqjcOr/minimal_poweramp_v3_skin_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/vgijDhb/58359211751.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/bj9hBSA/islands_for_sale.pdfIn PDF document text
    • https://badoxilorapa.weebly.com/uploads/1/3/5/3/135347885/lisusevitapufimiw.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/jc4Wagf/driving_school_classic_apk_indir_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/wSkbZgc/3ds_max_full_tutorial_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/hPiddja/24130874624.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/Iij3hal/slot_cars_tracks_melbourne.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/e0133aa782556.pdfIn PDF document text
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/36212165c0.pdfIn PDF document text
    • https://bugasezafefadi.weebly.com/uploads/1/3/1/6/131637254/7e06d5753ce.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/iieCrif/69795601577.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/fii8phj/pixel_swordfish_io_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/wowedofu/R1Fui5E/25428567762.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/ijjfjaQ/vodopijofij.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jcrigig/wifi_analyzer_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/gh1hhgf/zupagudibuxopumilaginupet.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/dafapedutowaxu_xetajojuw.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/41f42186-6eb5-457c-a187-89996f635699/cloud_atlas_story_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d13c73-68b7-42ed-8844-95dbf9f7e4be/92945448987.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_off00014210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 4940 bytes
SHA-256: 137d6eac5664976575b794ce6b652399c5887d5f2dee1dc98aa04eae42422ee6
font_01_sfnt_off000152ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AC 10936 bytes
SHA-256: 890eb85d5c875c6bf1f2d2b4ac280cdea7478394c378f88f18c401eeb2b3c3fc

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