Malicious PDF — malware analysis report

Static analysis result for SHA-256 399cb6871e23f486…

MALICIOUS

PDF

82.1 KB Created: 2021-05-08 17:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b9b50a937aaae7a47a6e40c6fbd53202 SHA-1: 58b3be443b3ef66e8b4b55202ed3de037274b8ae SHA-256: 399cb6871e23f4866ba3d2873ccdb785483a8c6a4815f19b6bee550bc83f63f0
194 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. It uses an invoice-themed lure. 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 0.9996

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/strik?utm_term=lexus+rx+350+invoice+price+2020 PDF link annotation
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/8045037.pdfIn PDF document text
    • https://dokivubugu.weebly.com/uploads/1/3/4/6/134688884/raxepadix.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/hgibggR/jolajeninefezekenezoji.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/4696966624.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/ghDIEha/download_game_launcher_tuner_for_boosting_performance_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/jbifHEn/lenuketubopijapidijasom.pdfIn PDF document text
    • http://titoto.xyz/fewujowowudox58hmh.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/diewhf8/hot_springs_story_apk_paid.pdfIn PDF document text
    • http://trend-sales.fun/deviantart_points_generator_online7e5hd.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/a665a2f94d9c8.pdfIn PDF document text
    • http://usesucre.pro/what_are_the_instrument_of_data_collection_in_researchdygrh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwopatovulid.rf.gd/cancer_de_prostata_localmente_avanzado.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_2514c497a0424a879baf1c95f9eb5ab5.pdf?index=trueIn PDF document text
    • http://zoxutuperovizo.epizy.com/rerawebulipinekewixowa.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_4038fa08e66b4343889949a54e4f4e53.pdf?index=trueIn PDF document text
    • http://xaraberedi.rf.gd/mugoti.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_ad1e6b6a8ef14e3d878fba8622f8e65e.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_83120fcef4554dc9849683401df0c88c.pdf?index=trueIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_7f5cc7352bab4c85b5197ea1aec8198f.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_f7c29dd3af9147078456796f6c4916e2.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_d34042b95da94773b10b91ea5c0ca226.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_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 5316 bytes
SHA-256: 542fb3ed267169c0061925015113502d55ee9b96e7a69e15c9e0fa63b18966d8
font_01_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 11240 bytes
SHA-256: 2f60c50c3f0891d24630084a13e1dd79b34eedafac7f8d2ccecca98afb1dc3f7