Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2da2dee41b4066e…

MALICIOUS

PDF

88.1 KB Created: 2021-03-05 00:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2246983c2185e17a60e9ed3eeb5c1a1f SHA-1: 86a98dc5fdbff758a8a570955cda031fd3de9cac SHA-256: c2da2dee41b4066ecd7460607966b43545117eedf40e145270fac9b2ec656f4b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=a+world+of+art+8th+edition+free+pdf PDF link annotation
    • https://cdn.sqhk.co/mawejoxejobe/ticjh0I/gajoru.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/lirafet.pdfIn PDF document text
    • http://pipvip.ru/29294087806sw2z8.pdfIn PDF document text
    • http://help-copyrightservice.xyz/8307612473d22d4.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/70616572970.pdfIn PDF document text
    • http://appless.space/348321489756h5ye.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/AjijayZ/blackboard_fcps1_marshall_middle_school.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/jepipejomu.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/10904621830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikubub.onlinewebshop.net/what_is_a_bell_jar_a_metaphor_of.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/52574863081.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/annette_alvarez-peters_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bd013d-2909-48e4-bdb8-9efd63fc69b1/healthrider_s300i_treadmill_review.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/87541997312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b685b1e-b325-4393-9d9b-f3ad2987f1f1/86369921938.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/27470195350.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_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 5224 bytes
SHA-256: 080ba61029741ff399d51cc48cb0b83f617324012a4af6cb8ddd678a163e385d
font_01_sfnt_off00012a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 12212 bytes
SHA-256: 8b3cdf94b18b9de815fe30c807310b6bdb771ef6197da2923ca711a2da86ad76

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