Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7e5a8f02ef91b6…

MALICIOUS

PDF

87.2 KB Created: 2021-02-15 15:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bdb66f5b9dbd77f53e3c0eb94de1c674 SHA-1: 2d6b608e8450da9f1409adfb6be3ad80722063b6 SHA-256: 5c7e5a8f02ef91b6b8d588ed6c5a85b703fa00a53d2f1550ff4eae08f5faf29d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains and Weebly/cdn.sqhk.co hosting, indicating a link farm designed to distribute content or manipulate search engine results. The primary URL identified is 'https://jacksth.ru/wix?keyword=outer+worlds+makes+space+suits+don%2527t+travel', which appears to be a lure.

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
  • 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/wix?keyword=outer+worlds+makes+space+suits+don%2527t+travel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fce910a6396b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5ff2a01b9ccf8.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/gewjbiV/45963592617.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/d7061ce25.pdfIn PDF document text
    • http://shoplus.info/94104995374fbnwu.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/547ef4d0a02.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/gdhmMoN/bojub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fe96845e10e9.pdfIn PDF document text
    • http://discout.online/brawl_stars_ios_ipalc57s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5ff79c6b4fade.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/7a56d9764.pdfIn PDF document text
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/e9bd81f8.pdfIn PDF document text
    • https://vomalutexoj.weebly.com/uploads/1/3/1/8/131871655/vogunewemo_nitikijemor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_6013762e7f49c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 5496 bytes
SHA-256: 1888bcdc24b50fdde589ba6078f0590f0dc40c2a9a7e641f83b7d9919b7d8317
font_01_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 10228 bytes
SHA-256: d606d4d709fc47ffd2c2d6c1c48cead18b153b13f2589d3b0099a9f91de4f87b

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