Malicious PDF — malware analysis report

Static analysis result for SHA-256 437cb768e153977d…

MALICIOUS

PDF

72.8 KB Created: 2021-01-17 14:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 25f4aeaf56e7fd3b52e5f696fd9065cd SHA-1: ebb74aed74fd713c8a5cf804ed152eee746005c1 SHA-256: 437cb768e153977d23c5b8581af3d3c94a30f57ce68e6eb5a009e89239387177
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with many pointing to disposable domains and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafftec.ru/aws?utm_term=simile+worksheets+grade+5 PDF link annotation
    • https://site-1172371.mozfiles.com/files/1172371/canciones_para_bailar_ballet_para_ninas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5f9f81ab9c234.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/c8tZ7Rc/hachi_movie_japanese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5fae7787cab63.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/yhcgejd/binalizedodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5fa1b7997d4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5faf61b341468.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/wHidiab/hack_raid_hq_ios.pdfIn PDF document text
    • http://fomaxos.22web.org/auckland_zoo_map.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/gfX2icC/3d_driving_class_mod_apk_rexdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fc9505734bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fe8cecf2ea0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovujopojat.epizy.com/chevrolet_ss_service_manual.pdfIn PDF document text
    • http://banumekopi.epizy.com/jufuvejinukumuneketazixov.pdfIn PDF document text
    • http://ritanuwo.epizy.com/t_shirt_template_free_online.pdfIn PDF document text
    • http://mowadavukusut.epizy.com/lepomotinirojikaf.pdfIn PDF document text
    • http://muwiliwus.epizy.com/introduction_to_modern_photogrammetry.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 5620 bytes
SHA-256: 438f69f78115afcc0f55a8652c1326e2fccb82807ae5f3f2799b9245038cd5d3
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 10744 bytes
SHA-256: f19b760b0564a7e098d3634cd5da6a911af4b1a45e2cebb4fbb47adf6ae4013e

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