Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb6d3c8ff0a61e8…

MALICIOUS

PDF

76.4 KB Created: 2021-01-19 20:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9d61aedafea4b4b22006a25c1eeba490 SHA-1: 18a3e11aacc0305d53e76c6a53ef76443fc457e2 SHA-256: abb6d3c8ff0a61e809b51f420bf6888d6dfa4d1a443e0bd5348ed0f3d9b6d301
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/123?utm_term=cuantos+pies+tiene+un+acre+lineal PDF link annotation
    • https://cdn.sqhk.co/foroboreb/gcgjRYt/todozeliwofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8bf0198b7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_5fa593a2c3709.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/godenaxaxixan_xorokib.pdfIn PDF document text
    • https://niriretof.weebly.com/uploads/1/3/4/4/134488174/904120.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/nolifirazusa_lolaluforedupin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388067/normal_5ffef8bd5a3fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5fe205994d2d8.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/zusuzuw_bikiwosudode_gokikukenawaj_rasidajiviz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fe41c6bb79c8.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/turotaj_dakebimulodi.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/3ceda651b4e43.pdfIn PDF document text
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/gamefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fa24f896233f.pdfIn PDF document text
    • https://rifusefabizavi.weebly.com/uploads/1/3/2/3/132303317/aa2660db6eecc.pdfIn PDF document text
    • https://jufoxaju.weebly.com/uploads/1/3/4/4/134489692/kejimovesoxibejebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fdb59294103f.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/bx5xhfd/popcaan_block_traffic_music_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/uWZAvjf/hangman_s_fracture_radiology_assistant.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/roxawo/nomupoxurukudatiperufuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/8794386057.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/taxabut.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/carboxiterapia_dosis.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_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 4832 bytes
SHA-256: e47f47a784b8086501757d238a2107cf31bd562bcb0864f150aba081619d44bd
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 11500 bytes
SHA-256: 6fb612436663df7444ff6b58e7f4f83ac1274c114070dea90eb20e5a043c50b1