Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12d966e9dd5b151…

MALICIOUS

PDF

72.2 KB Created: 2021-02-20 16:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce7974bccdb4e7ecd02e850bb5a7f21d SHA-1: 46f3a4341a1c08835adf23b6d4c51612f680a951 SHA-256: c12d966e9dd5b1519c3fc9b3fb92d46d07dce866e62399bb21de32fcbf2fa274
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://baarspo.ru/strik?utm_term=honda+eu1000i+inverter+generator+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4528876/normal_602f985866405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5ff29528df631.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/fukovizivojevole8cfbf.pdfIn PDF document text
    • http://mestorating.ru/92929055047mh22.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/iOUggjf/ritidavamepiwusetenogepuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_60290e9087aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_601d938770039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_600c2b0e955f5.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/hjiSpgh/world_football_champions_league_2019_soccer_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/V2gjXid/nhl_news_and_rumors_flyers.pdfIn PDF document text
    • https://jupojunidukeze.weebly.com/uploads/1/3/4/0/134012404/letevakilitodir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_600ac82d81b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_6029725049c75.pdfIn PDF document text
    • http://idealicait.site/download_cheat_top_boat_racing_simulator_3dnt4n0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/take_five_clarinet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/lixetalepapulugerevise.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/cooktop_brastemp_4_bocas_manual.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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 5180 bytes
SHA-256: 09f3e5537a21b71554ada09462179ddcefe6f00e02044b4d714b749f4c4d7542
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10696 bytes
SHA-256: f3ffbf4070ef3ca2e493977634fcb50c6a8bfe6f271ac7ac325b3cebcf8310fa

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