Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6080fa806db74be…

MALICIOUS

PDF

73.9 KB Created: 2021-04-29 10:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 31631eb4ad9174710f932f540eae18d0 SHA-1: becd084f0844e8a29130669ccaa9a3daf56e689e SHA-256: f6080fa806db74be12ef696431bfc83307bb352bc7f7e8bb031fd059a2313924
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. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The embedded document body text, though garbled, mentions financial accounting, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=financial+accounting+for+mbas+7th+edition+solutions PDF link annotation
    • https://cdn.sqhk.co/zerurukoraju/nhikOgh/togixasejosutebupewake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fd091d5da2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_604eb4d1e7148.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/cCtL3gj/fugamebopoxomolumaboba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_60648dbe4f0ba.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/OhhaLZQ/advert_script_template.pdfIn PDF document text
    • http://surevixa.22web.org/ikea_hemnes_double_bed_assembly_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/8En9bvz/fanogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fe89dee5759e.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/nhbHydl/216701464.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/atlantis_water_park_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_ab8c3ef0875148cf9c8c575780b1ad85.pdf?index=trueIn PDF document text
    • http://gitodake.myartsonline.com/american_dv_lottery_2020_application_form.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_6fc0bc34800d49b6b425a53aede7281d.pdf?index=trueIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_1262ff5b26e74bec98bf45d24f6b755b.pdf?index=trueIn PDF document text
    • http://jimulopipuxofom.rf.gd/49283874958.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_fb5e6bb0da9947d7b36bed2d36e2a872.pdf?index=trueIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_4f303e81612241419eb78ce556b90adb.pdf?index=trueIn PDF document text
    • http://vadisukadanu.rf.gd/15098337163.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_9b1eda74dcf440f8ab2642a123d574e6.pdf?index=trueIn 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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5612 bytes
SHA-256: 61fc875a74a2306a7a557024d565f3d4eacbe47672847946b3f5174de79e9c6d
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 11312 bytes
SHA-256: f82ff283e656cc50154ff9f9757a8c6f77f18f414589ae46eeeaccccb1a4bb65