Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d3402f4f83bf07…

MALICIOUS

PDF

123.9 KB Created: 2021-03-09 06:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3baa99be11a7b23870b93b06b99af2bc SHA-1: 104bf6c2d927c98d22ce8862197570571eaff876 SHA-256: c5d3402f4f83bf07f2e385b7837dd11a44464a552995f48bc5c987312791ea74
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/award?keyword=mitsubishi+alternator+wiring+diagram+pdf PDF link annotation
    • http://naturfresh.space/598795947546byam.pdfIn PDF document text
    • http://feedbacrnz.space/badatekifujejexinm2aak.pdfIn PDF document text
    • http://fiwusenipabaj.iblogger.org/pioneer_deh_150mp_change_clock.pdfIn PDF document text
    • http://dusixose.22web.org/zapogumibagitoxonigu.pdfIn PDF document text
    • http://gikilebi.iblogger.org/avira_internet_security_free_2016.pdfIn PDF document text
    • http://drovazvenigorod.ru/18779263895oem1o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_aed827c98e824168b4f5bf39636615ed.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_3ac698f9e9e749aeb3e5249c8d8134ad.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_aebe883e28ad4dbeaf3688a98eb1de14.pdf?index=trueIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_bcdad6f6cc704af59839b8841f55b34b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/26715676451.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/30273679427.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_8df9feb5d8fe405c87c4a09f7dfbc67f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/fapus.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_064857daee404ecd90d522a3a0960b86.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_ef397a5397c145899c703817060612fe.pdf?index=trueIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_24a761f9b2f548389556b0571c311887.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0666b41498f44dd399f9d07fe2abb6f9.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_45d4793dbacb41eaa62a8ee6c268c8da.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_58db907268794727a0f739d6ac6e5059.pdf?index=trueIn PDF document text
    • http://fipamopiwip.epizy.com/olx_app_apk_old_version.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_off0001a88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A88B 5692 bytes
SHA-256: 62875108515fc8a74e3be5aef0878866b77cc7adb5ed633a7d3f409605c53e0f
font_01_sfnt_off0001bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBD5 11148 bytes
SHA-256: aaa1bfa2ca377489f70e017d07fa418dd3b69108ec16c47c77a0c7c76fe30526

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