Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f2c51b7a58f5bc…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9e0926aa3b10ca675ca7999b9db4b3e SHA-1: 97476c0a422bb7a0c61d6c63729118126a2b2403 SHA-256: c7f2c51b7a58f5bc69214aecbbf3588d1ca6a7b7de41e221ba076403cf584309
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://druttle.ru/strik?utm_term=can+acca+student+work+in+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370989/normal_601c896fe8d6f.pdfIn PDF document text
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/wolatirawoxen_fowuv_tazitiluwinojuw_nomemuzapevif.pdfIn PDF document text
    • http://ideal-it.fun/brake_buddy_classic_3_reviewswxezs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fd0f71076be1.pdfIn PDF document text
    • http://reduslim-sito.site/pudofuduvevapivoxezoa5dio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_601889cb246b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_602c927c4f16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_6015bd6525d61.pdfIn PDF document text
    • https://sudefenumub.weebly.com/uploads/1/3/5/9/135984534/379f23.pdfIn PDF document text
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/bevofemeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_6009098c53bde.pdfIn PDF document text
    • http://blue-tick-central.com/xegabe3l77e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_60636d606c776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_605ac56e878ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_6049a7cbf41c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_600b1f2e6b311.pdfIn PDF document text
    • http://kvadro63.ru/decorator_design_pattern_in_java_with_realtime_example0fjjf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_60406a588731d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601b30c89782f.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/6304715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenexafa.myartsonline.com/binixeneguraf.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/polaris_280_parts_wall_fitting.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/broom_2020_effective_public_relations.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 4964 bytes
SHA-256: 40ba2638416df8b07455c043160af48a0b8fac9cf7393d7d1cbb317d007ba718
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 11076 bytes
SHA-256: b33b4b0d5e3d6d7e5776d02a4db51d3b195625087847cb6ac3cac46303ad02aa

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