Malicious PDF — malware analysis report

Static analysis result for SHA-256 8099f7ea780a7054…

MALICIOUS

PDF

77.8 KB Created: 2021-02-13 07:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9ecbca126269acebd12fec80973f440f SHA-1: 7f7bc0247efc8793390f896a10aaacadff7e6128 SHA-256: 8099f7ea780a70543b49258ca236386e227c2a1c2180ea69dcbabd73b343ff83
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links pointing to disposable domains and link farms, suggesting a phishing or SEO manipulation scheme. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

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://bologen.ru/wix?keyword=paper+mario+thousand+year+door+guide+book PDF link annotation
    • https://cdn.sqhk.co/xajamenujo/Smxbhh5/89222166273.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/ggjDpjd/29082908185.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/1262423.pdfIn PDF document text
    • https://rofewure.weebly.com/uploads/1/3/3/9/133999154/000ec596b.pdfIn PDF document text
    • https://cdn.sqhk.co/vijasezadida/hfLjfPw/free_background_music_for_videos_soundcloud.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/8288644.pdfIn PDF document text
    • https://cdn.sqhk.co/gozafavapawu/rgjofic/criminal_case_search_delaware.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_601500dc9cbca.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwafuwawen/gJify54/20249618898.pdfIn PDF document text
    • http://auto-fishing-rods1.club/ielts_6_reading_test_2_answersuz743.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/jebamesimu_topip_pawewutu_lozepoposofemi.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/zunebuninowa.pdfIn PDF document text
    • https://tatosexu.weebly.com/uploads/1/3/0/9/130969313/lafijisopalumi_sezukoduresip_posugomek.pdfIn PDF document text
    • http://1freedom.space/bmat_s2_assumed_knowledge_guidefsrt4.pdfIn PDF document text
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/3182276.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/hg61iii/welowosalalajikade.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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 5648 bytes
SHA-256: 3d5d24b6d3ce94477c6042badf73675371f36f3619dff1d8c013fe39ec9b042f
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10624 bytes
SHA-256: 9cb0bb0e96c92d276ed0d9a2e6b38c436a86906c142a438c8249b554fa9215d8

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