Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7534058a185220…

MALICIOUS

PDF

72.9 KB Created: 2021-02-13 13:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c771a9684240617bdca82c23eeb39a39 SHA-1: 850a8c4997c98327e7579a591c294d0e0631d29a SHA-256: 5a7534058a185220106e2c67b67a6ad679b428ad4006be09c04ad6cecaf4b58f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying links to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the document's structure and embedded links suggest it's designed to trick users into visiting malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=multivariate+data+analysis+joseph+f.+hair+pdf In PDF document text
    • http://dvestideyli.xyz/zosufefiwonerifivamiscw0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_60146764962f0.pdfIn PDF document text
    • http://republvinb.fun/joluzolapexupelajz2vo2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fcf451675d31.pdfIn PDF document text
    • http://wirelessinfo.ru/16890075702yiaan.pdfIn PDF document text
    • http://sokfresh.fun/apk_drone_view_official_mobile_legend9hche.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/paint_color_color_by_number_mod_apke15ez.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/Qij9idF/80336441466.pdfIn PDF document text
    • http://zobebukore.22web.org/my_singing_monsters_breeding_guide_bowgart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunixojojulif.epizy.com/42243205380.pdfIn PDF document text
    • http://butevagowug.epizy.com/90478967321.pdfIn PDF document text
    • http://resisojopemolo.epizy.com/disej.pdfIn PDF document text
    • http://vuwepowav.epizy.com/7828740045.pdfIn PDF document text
    • http://paritoxo.rf.gd/84340381051.pdfIn PDF document text
    • http://ravojetejevigim.epizy.com/73098137379.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 5404 bytes
SHA-256: 4ee8b3b4b1a32b66f288cedcd4510da3cfaa7071f10cf135a5eae523226ec2cf
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10644 bytes
SHA-256: ffdcada067572b13f12b492a86f392af9df7d629a598f55fa42738ffc8851c65

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