Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f6f480d7af374c…

MALICIOUS

PDF

67.6 KB Created: 2020-12-22 06:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ad4e85a6abd38f1f23d30c9334de08b7 SHA-1: 94344c2a0955a270e3256dabddec0e75d5971fb2 SHA-256: c5f6f480d7af374cb8e50de2508f9553c2915dccc592812800ed7718e8333bd9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users. One prominent URL, 'https://cctraff.ru/strik?utm_term=rivals+at+war+2084+apk+download', suggests a lure related to game downloads, likely leading to malicious content or phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://cctraff.ru/strik?utm_term=rivals+at+war+2084+apk+download In PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/6e1ec0bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fc684561d8e5.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/mazowo-gurulevuraf.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/f58cfaf52d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5fca8d0e8d183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f9316ae01352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fc2a443b8eaa.pdfIn PDF document text
    • https://mejodulifewu.weebly.com/uploads/1/3/4/5/134526208/wetorobupiditat.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/pufur_wevatu_jadinipe_tojiruj.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/fegemabib_tivevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_5fb72c98a1230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5f9f2f04510d3.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/xulowebosede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 5732 bytes
SHA-256: b30fca1987c413ba62fdd8208749ddf4d4cac05cc0368a603e5d055cca7a2008
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10872 bytes
SHA-256: 44dd3c13ed73e7cc326cb00398b98df894242c1f0a06a0f88f2be7ec1c659adb

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