Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec436ce7424f9487…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 17:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b88ce1599b991f1f970ee95103269516 SHA-1: 16f699320ea515a25405f7cddaa38ea0abb528cf SHA-256: ec436ce7424f948775596875c0fcfa09ac5508d97242c6db8b0f1b7d15848dde
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 0.9990

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://dafemum.ru/strik?utm_term=fit+for+life+llc+louisville+co PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fc5a40655eea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fc7a806eae8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fc6c74031973.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/sjNicjd/fijorasaxibirogame.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/3iNhegg/50363977258.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/gta_v_premium_edition_ps4_what_do_you_get.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475992/normal_600339ec2daf2.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/djajbie/cars_3_colouring_book.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/92777494067.pdfIn PDF document text
    • https://cdn.sqhk.co/mivivezar/jSzBYsg/50712994328.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/gcEbwPZ/auction_time_grain_truck_results.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/vNjgjgg/fomigaz.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/xoxaminuw1l0y.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/zedumov.pdfIn PDF document text
    • http://sunshop.pro/michigan_common_core_standards_math_6th_graded567e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_604f7684abb38.pdfIn PDF document text
    • https://cdn.sqhk.co/lutugivaje/cmjjbhe/suwobokojumaburip.pdfIn PDF document text
    • http://rodina38.ru/52894806588z8911.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/gfeoDbB/towakumepin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_f37b31b32a694395add50ddd9b8e2c6e.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_4ed63847f24c4f36809bf55fd3158fd7.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_c338eb2fb0c34e2d98651e9381b691b1.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_2db20bfe6564487a860e8cdc51f0dddb.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_a0d7465ef42547a6a3d9c83d17a343b3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 7228 bytes
SHA-256: b958644797802d9d503fa56f0dff5bd9e90bb8eff731dcf2f4b16f15460f218f
font_01_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 4680 bytes
SHA-256: 4e31794a83bf9d3895fec4264b00c3288430b5dc24e2043b8bd7d739ea525fa2
font_02_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 10872 bytes
SHA-256: 1b76bf59453fcd23c2c7480b187d72dfe7a59e188eb741069d878beebb61cf9d