Malicious PDF — malware analysis report

Static analysis result for SHA-256 e160ea66cd84150a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 02:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d82eb77fcd81fffb59be26dabf2cec51 SHA-1: e521d189b9b4cfc37d33b7e8fa75c780a8dc1090 SHA-256: e160ea66cd84150abb0c5275d64c803c7243be401c9ddba284b9f07f5d2c1cc9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious external sites, possibly for credential harvesting or further malware delivery.

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://gimoguvi.ru/strik?utm_term=how+to+study+for+airframe+and+powerplant+oral+and+practical PDF link annotation
    • http://lnstagramverifiedsbadgeforms.com/7979383058312gn7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5fe084a79056f.pdfIn PDF document text
    • http://igafnd.org/skate_art_3d_apk_downloaditplt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6023800d4d3e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_603ecc04adfc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_602d729444497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_6019f47d91c0c.pdfIn PDF document text
    • http://pochta-24.cc/daily_life_of_ancient_egyptian_priestsdhz5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_604183608a59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_60289c9a774dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6030891337c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5fdc2e2b6bf2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_1165d490a695444fac49f681bde6c37b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/i_love_you_more_than_anything_meaning_in_hindi.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_34f0fb16d0eb44e2bcd120884d477250.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_b5d9a7dd8ed349cfa62b1bf756a28580.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_b02f08de9b4444c191ffa13d5a7d3e98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/african_savanna_food_web_worksheet_answers.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_03fd267a389f4ddfaaad3c3d0be08f80.pdf?index=trueIn 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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5456 bytes
SHA-256: 9c63fa899b15e08fb23cd030a1861e97267d5be7b02b69f9aa5cee6fac799cdf
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 11084 bytes
SHA-256: af42ae2f95ceab2d409f1be7e6d0ab7b4217e6adc7d1f9b9717174f07222042e

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