Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff73bcb2695fed6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 02:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 49c9ce541c5c50762a774002d15aa855 SHA-1: c2046bba0e7d5f4c966b66dc501e9eb7d404d096 SHA-256: fff73bcb2695fed6ab5f66659846ac38d6d5bc02930a55b11336b3229455c4cd
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 0.9992

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://jumiwimov.ru/award?keyword=resumo+tabela+peri%25C3%25B3dica+pdf PDF link annotation
    • http://neojust.ru/letagir3zew.pdfIn PDF document text
    • https://dajixogemozuv.weebly.com/uploads/1/3/1/4/131438707/lulikigeralevipuwe.pdfIn PDF document text
    • http://verifiedbadges-form.com/justice_league_cartoon_network_episodesvh2yl.pdfIn PDF document text
    • http://xtina.online/zamoruvimagifuwufamo3kdf0.pdfIn PDF document text
    • http://vir-tus.com/powerbeats_2_wireless_reviewabnch.pdfIn PDF document text
    • http://coins24h.com/lotuveletvh2sw.pdfIn PDF document text
    • http://olipaka.xyz/husqvarna_snowblower_carb_cleaningoepxe.pdfIn PDF document text
    • http://ideaita.fun/whirlpool_duet_steam_washer_and_dryer_manual52g18.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/6351427.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/harbor_breeze_fan_remote_codeszlvve.pdfIn PDF document text
    • http://sayfelengs.space/instalaciones_de_gas_domiciliario_santa_cruzv0ts8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_1ed165b040554c4e92321172fc21f45a.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_7dae0bbc717444b3840c1c3c9c1e6d90.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_65d6da5d23764596b2a2a84d32792264.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_cd223a421b57452ba30af65f8889d19d.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_0fbf9d55a3d3472a9a0142f33afd70b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5822f8-bc47-41bb-aea2-5e00e70466dd/dajixukexeximi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33c6fac-6ddb-4d94-bcc4-6f10caa2d474/what_are_customer_service_operations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4626420e-24b4-4d4b-9a96-26b907b2b149/62474463794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9186ba66-ee67-4f93-bca4-71369e149944/jesixar.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_fc476ff74aff46e8a6784ae0eff0af9e.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_66674c65fe504ca29be22f21f233886c.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_1b40effa3af54bd4ab4a81af4ff59d97.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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 5584 bytes
SHA-256: 8712d7b224317bc8a32450f0e1dcd761206ed5d0d78a6804b950f8ac0aae9a4b
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 12728 bytes
SHA-256: 361c3084e07240872111cfb2bdf0f61a900a84a4908fcc2dbbba5db9f3bdd578