Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd57cf5e960c0733…

MALICIOUS

PDF

87.2 KB Created: 2021-06-06 13:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc875e29b01cb3e1325660e5b165c94f SHA-1: 3e186502475cbf244915ddaa70b1ce4f245d6b52 SHA-256: cd57cf5e960c0733dd127628eff441e8a11bc948cc0969549615b6579050865c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/123?utm_term=bepro+powerpoint+business+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446166/normal_60bad9e9a997c.pdfIn PDF document text
    • https://foduvixet.weebly.com/uploads/1/3/4/4/134498725/nibigosefu-jixotowagid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fefa1df8c893.pdfIn PDF document text
    • https://mogalarozo.weebly.com/uploads/1/3/5/9/135968713/lefodiwugazolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5fe20953be69f.pdfIn PDF document text
    • https://lasezafokovopar.weebly.com/uploads/1/3/5/2/135294620/timipakegigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601df4f8725e8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375696/normal_60b729d50afa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/60076dc6-2ba3-4fa8-9ba5-cbb983b45db6/nirugowusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f10eb12-296d-4ec2-a1ef-e4f97affea50/how_do_i_create_a_healthy_meal_plan.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/how_to_get_things_from_animal_crossing_pocket_camp.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/venerefuroxoluralirugot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860e9ad5-2606-468d-8922-8e5a08cda4c0/piriformis_syndrome_exercises_physical_therapy.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144467418/tumofef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5dcac4-3a3e-4164-9076-14cd1379b305/27819929559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c37f00e-5159-4958-83c4-e5decd6a14ce/how_to_learn_english_simple_way.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc285a80-4912-4609-9032-09841d003ab7/pamegifiwuwajuf.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/pewapiz.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/how_to_clean_an_aerobika.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/broski.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995d6e7c-1b6d-4912-99a0-fe23efda76eb/coh2o6_cl2_name.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144719445/72956777613.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144454959/29683102094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b3742d-5e52-49b1-96fa-6d446d639cf8/how_to_turn_off_demo_mode_sony_bravia_tv.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 5248 bytes
SHA-256: 3a34785dc5239bbbfed1808a83b31a4c15dca1fa1a360680f74b7b5743fb818b
font_01_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 7620 bytes
SHA-256: 3d72bcb67ac4d6f930add1ede078b6499c07a3ae011b28cd8812555286c01a97
font_02_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 10688 bytes
SHA-256: 5ab9e4849f2c3b91f7a6195aae555ce024cb8e61a902748e5e79e1ddae02ec06

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