Malicious PDF — malware analysis report

Static analysis result for SHA-256 494f0b895b6942d9…

MALICIOUS

PDF

78.6 KB Created: 2021-02-13 12:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3fd7223fef3ea27bf99a9bab936812a1 SHA-1: 540c3bbe9bbb5c88396bf4c6528cb6a2be1db24d SHA-256: 494f0b895b6942d9794baee3942a13a7319ef8601e9c702c52be4e6db85e2039
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm or SEO manipulation scheme. The critical heuristic firings indicate that some links lead to known malicious redirectors, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure strongly suggests a malicious intent to redirect users to potentially harmful content.

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://yafferge.ru/123?utm_term=gloucester+love+in+king+lear+timeline In PDF document text
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/3766226.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/xujob_koneropeso_salawuturavotul_galevubilovipaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_6011fa2bed570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_600df117bde55.pdfIn PDF document text
    • https://jifonoru.weebly.com/uploads/1/3/5/3/135316211/dd56367f7a8a20.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/9f2dc969c.pdfIn PDF document text
    • https://pifisurap.weebly.com/uploads/1/3/4/1/134108900/fonapumikume.pdfIn PDF document text
    • https://wenudujajavu.weebly.com/uploads/1/3/5/3/135318124/pufolubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ff6803237b07.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/3007665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5ff28643cdc9c.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/waboxabijovo-vubike.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/chiller_hitachi_manual.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/zurowapofez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepugip.epizy.com/corporate_party_invitation_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/emotional_intelligence_2._0_ebook_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 5272 bytes
SHA-256: f1da0173693d8ddf94b061ce94fa67d6a2a3be3c45d4c1d4a66a5442b4b9096d
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10712 bytes
SHA-256: 4bb403872c900400090ecd7a9ee990d282d1fa8f26f971c041da38a88ab3918d

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