Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5706906e95e2875…

MALICIOUS

PDF

74.8 KB Created: 2021-03-29 21:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd421d2380bb9584d04f8375ac7dab69 SHA-1: 2e3b097d9be1c5b7c374cde8b27898d4ce7d3e3d SHA-256: b5706906e95e287547e7752cc015a52e7617003a4dde654e6beaf3963260ff12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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/strik?utm_term=french+english+dictionary+app+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6023c62063dc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_5ffcff413d348.pdfIn PDF document text
    • http://pijojavoto.mygamesonline.org/76969106965.pdfIn PDF document text
    • http://rubyshup.space/tusakinubakalubige2hizj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_60590abb1406a.pdfIn PDF document text
    • http://lnstagrambusiness.com/kexusuwoxefutumu8nde9.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/60154428432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff3076b3d3e2.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/88118593993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5ff3c5a3106c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_5fd10017d626e.pdfIn PDF document text
    • http://wersita.space/jofusejuki63ss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_60464288d6a3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakifavu.onlinewebshop.net/green_card_application_form.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_ff6b66ec4f554d9488bd2ed20c5ada7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/diastasis_recti_exercises_before_and_after.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/77505982523.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_5f19469b7235493aae91e18df773f1bd.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5568 bytes
SHA-256: 6707b56d70a36fcda2038f526471529a47948957e9fa1756c415f344bf67c815
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10836 bytes
SHA-256: a376e00cc3c42b09f0c699a581b0d93beaefb0a4a79836bd7631236e69f96244

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