Malicious PDF — malware analysis report

Static analysis result for SHA-256 629b86082791a5c0…

MALICIOUS

PDF

75.0 KB Created: 2021-03-02 03:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 791ef8a04aee8abe0a48db9d63e78723 SHA-1: 2e06b41be62344b1c2fe90d414e073fba76e2b7c SHA-256: 629b86082791a5c01ba02d0c29f7f0391117de9f89ccd69c8d36de334c31ddd8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic to distribute malware or phish users. The embedded URLs and the PDF's structure strongly suggest it's part of a campaign to drive traffic to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=what+is+point+slope+form+with+two+points PDF link annotation
    • http://sibasijiv.22web.org/inspire_science_grade_4_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/jihh8yb/wotofexop.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/xabutux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_601d68efb8f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fdb6b7f12bb8.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8r1MRHy/siwibefotiduxidudenafomen.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/4ghjd6I/41309138941.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/bejamutiwobajuxadiwozuxol.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/zodopujuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/QXtggeg/58582856898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5fe56b27019bf.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/rhjtTFk/rufus.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/naxizugenabi/61794086086.pdfIn PDF document text
    • http://zexiditakobo.rf.gd/dillon_550b_progressive_reloading_press.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/how_to_fill_bissell_big_green_machine.pdfIn PDF document text
    • http://vafavesutabera.epizy.com/suwofime.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5244 bytes
SHA-256: 3ff67c340afbd80a1a6ea3558fcc4728bc30fc00c5387abc0242c9f1e2f695e9
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 11160 bytes
SHA-256: 45f09de62736a3a9f44390ba89e75e4445fd8be4f9579b63d53af279cb4c5d8d

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