Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f2158870ef3e3…

MALICIOUS

PDF

77.0 KB Created: 2021-02-15 19:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c207f16b2e947d807e8e16c8d505a35d SHA-1: 2f91fb9240381ebf778c524a861ff8d418434773 SHA-256: df1f2158870ef3e3304232304f7175a799c3af406548dd10a988a20e77463045
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm designed to redirect users to external sites, with one prominent URL being `https://jacksth.ru/strik?utm_term=logo+quiz+guess+the+brand+answers+level+16`. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=logo+quiz+guess+the+brand+answers+level+16 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379046/normal_6014cb92480c0.pdfIn PDF document text
    • http://zebrait.fun/basic_barbell_training3tmw8.pdfIn PDF document text
    • http://reduslim-shop.website/stickman_dismount_ragdoll_mod_apkfiqx1.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/great_powerpoint_design_templates.pdfIn PDF document text
    • http://universe1.space/2894690999ieu83.pdfIn PDF document text
    • http://bepegut.iblogger.org/giwajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_6007faeb696b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5ff298994ae39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6020b5c1078b2.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/mimas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/lagu_lily_koplo_chacha.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/33612427474.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/koxotosapedalepibixasowu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5584 bytes
SHA-256: ad19c40dd7056275488e8d56c92178893c651045c08b36f0b36aba91152d67f8
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 11152 bytes
SHA-256: a485983125797e2da33fc0f5af763d4994f1910c6e9f1cb5f340c64302d2c798
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.