Malicious PDF — malware analysis report

Static analysis result for SHA-256 510b1dc267336416…

MALICIOUS

PDF

81.3 KB Created: 2021-02-28 12:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c2925e0c2edc0585ef7f73a88b3da3fc SHA-1: c0c1566f5afdde04ae7783d08b04e81fb33e83b9 SHA-256: 510b1dc26733641666532babae031748fabb4558f7837d94450e07ad6ea2b975
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Stihl chainsaw service repair manual'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution scheme. The primary attack vector appears to be social engineering via a seemingly legitimate document, leading to a malicious URL.

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://baarspo.ru/strik?utm_term=stihl+chainsaw+ms+180+service+repair+manual PDF link annotation
    • http://zemawage.22web.org/48373655798.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/5ibq4gf/set_ringtone_galaxy_a20.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/bj8BJvo/66845062681.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jchfgiN/48421427270.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/hiyicZM/need_for_car_racing_real_speed_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fe74a19bb1ed.pdfIn PDF document text
    • http://1fps.ru/nodivuwenijuxudajuqyxpx.pdfIn PDF document text
    • http://bella24.xyz/gevape9pcy0.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/ehgpKjh/balenciaga_sweater_dress.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/dzmCdij/rumble_on_news.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/g7Qm1ja/talking_tom_cat_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimunofat.epizy.com/flexible_closed_cell_foam_insulation_sheets.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/210421334.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/seluburo.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_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 5816 bytes
SHA-256: 7775ef336b3b0865f734c02131753d740eb8c466bff5dbae6cf59014acccee5c
font_01_sfnt_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 10996 bytes
SHA-256: d2c48d81aaa654fbf06fe505ca10e814588ec71367f92217ffa59563f0da9e53

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