Malicious PDF — malware analysis report

Static analysis result for SHA-256 d427ff63202e30f3…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 01:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d327c51b578431513682a5475548b544 SHA-1: 18c3a29470351eebdab09e71244dcd46f9a15b44 SHA-256: d427ff63202e30f347d6f3fc13358ebddb45cdbfdbf1ada28efa4ac957341d10
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=plt+legend+pairing+to+computer PDF link annotation
    • https://cdn.sqhk.co/bemaxopig/hcGY34s/catalogue_movie_collection.pdfIn PDF document text
    • http://homiak.fun/volume_of_rectangular_prism_worksheet_word_problemsgl5k5.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/xexamanijakex.pdfIn PDF document text
    • https://cdn.sqhk.co/solaxutom/zMLh1ia/10729937351.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/63621595070.pdfIn PDF document text
    • http://mmamba.ru/febavipitoniruzosudurolip3zqhl.pdfIn PDF document text
    • https://cdn.sqhk.co/dujovibipu/bLvZzR3/38870553351.pdfIn PDF document text
    • http://auth02mobility.com/metro_2033_redux_weapons_guideta65v.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/vudatarazewa.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/dogik_gilirix_vuvulo.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/o1KjbK9/setikexojer.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/93238226625.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/rawogarirefiwilesuzinivux.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/80Nthhp/sogolikukotajomabifevuref.pdfIn PDF document text
    • https://ropoluwuxonixol.weebly.com/uploads/1/3/4/6/134692090/735176.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/luzitu.pdfIn PDF document text
    • https://sunudufexune.weebly.com/uploads/1/3/0/8/130874439/6cf353b82ff.pdfIn PDF document text
    • https://cdn.sqhk.co/gorubabor/t3haWxO/43573015869.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/sapogabojino_zodowime_dezido.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/how_do_you_sell_back_leave_days_in_the_navy.pdfIn PDF document text
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/8060651.pdfIn PDF document text
    • https://pixojewunut.weebly.com/uploads/1/3/2/6/132695451/fijasore-rotum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawokale.myartsonline.com/53459884791.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_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 5216 bytes
SHA-256: 99c32e0e1217d210f805b9badf779c325ac0c47eb08a6429e5a1e68fb1477f76
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 11100 bytes
SHA-256: ee8a0de1f7a65bb28c647baf98988e4509fa851db4ba6b291148f16a87746a4b

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