Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2309fa93c9c123…

MALICIOUS

PDF

86.3 KB Created: 2021-03-30 09:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 75ecc7754113e402a22ee2842bea16b9 SHA-1: c5fd1f12425d85cb02f8a2e58943ee284bcb4d2d SHA-256: 8d2309fa93c9c12388d4a081fe2808a44f369a30001613c945607be34c57ca25
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://druttle.ru/wix?keyword=neverwinter+xbox+one+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414687/normal_6027e7c8bb0c7.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/kumikukedodik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fcc365b99fe1.pdfIn PDF document text
    • https://surugodinatuv.weebly.com/uploads/1/3/4/8/134861851/cfcfc975eeeb15.pdfIn PDF document text
    • https://goneduxif.weebly.com/uploads/1/3/0/9/130969586/578447ad993ebd.pdfIn PDF document text
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/kuzegaladomofinuviga.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/ZWpighj/ultimate_shark_simulator_all_bosses.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/c95dbeb9520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6023b8428bcb6.pdfIn PDF document text
    • https://losazutuliwuja.weebly.com/uploads/1/3/4/6/134622760/woboguwix-xodinuniw-semax.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/ponuxemoba_watupama_dawusoz_gofis.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/64f12.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/3660883.pdfIn PDF document text
    • https://cdn.sqhk.co/lodoseduler/hfjjjau/experimental_design_worksheet_1.pdfIn PDF document text
    • https://kazedodaregiz.weebly.com/uploads/1/3/4/3/134368633/d242f641e7.pdfIn PDF document text
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/94ced2cbf.pdfIn PDF document text
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/gifipotugajenas.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/wavexokoxamixok-wowiperomapak-jewixavuboni-posalidolagu.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/65821a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_6024ff7474684.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/hd5cvXZ/rumuvodutivesasopanezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/bufubotavonosopemot.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/vijepabifigevuxebovibu.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/how_to_add_fractions_with_whole_numbers_and_different_denominators.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/79263495605.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/grundfos_irrigation_pump_handbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 4816 bytes
SHA-256: 79bae682b38a9e32ff5a6045e0efaa24c4472951e29ece8b9d61323dcf25f588
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 11172 bytes
SHA-256: eca85831145af791a40f8d655db65746e94e5e31bb4d971ecf32d641e2e794ab
font_02_sfnt_off00013d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D43 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3