Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbc16ed73c6fda4…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 13:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f0a606ae7177609598dc48ef29e3eaf0 SHA-1: ee06ad729d94d901df6d566b54106e770795a6ec SHA-256: cdbc16ed73c6fda41caf29eda498501738c948cda53ea57f7742094768d2e741
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to PDFs hosted on disposable domains, a common tactic for SEO spam or malware distribution. The presence of multiple external URIs and a link farm heuristic strongly suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/award?keyword=ikea+brimnes+daybed+instructions+pdf PDF link annotation
    • http://priz24.site/star_trek_enterprise_ship_layoutzl2yt.pdfIn PDF document text
    • http://prequester.online/gifexusixake3lgwj.pdfIn PDF document text
    • http://mjawebdesign.net/calling_in_the_one_free_download300sa.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/ginal_lejelub_resaneg.pdfIn PDF document text
    • https://mibivatoroxup.weebly.com/uploads/1/3/4/7/134762409/gumafumu_bulutoxavan_buzametuvig.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/bgcdWgd/juvosomefebojanagog.pdfIn PDF document text
    • http://nelodagavezes.mygamesonline.org/general_affidavit_template.pdfIn PDF document text
    • http://alcozerox.com/90180117813dovgs.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/galokirojurarawu.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/ea187.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/alternity_starcraft_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/redugagezi/6nIjbgf/metformin_uses_in_pregnancy.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/lipabetibu.pdfIn PDF document text
    • https://jovovanin.weebly.com/uploads/1/3/1/8/131871717/kuloboku.pdfIn PDF document text
    • http://legiontry.online/will_stock_market_open_tomorrowa7y9z.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/6338128.pdfIn PDF document text
    • https://cdn.sqhk.co/wovovoteg/gihaFni/picasim_flight_simulator_apk_for_pc.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/kabikikutemuxax.pdfIn PDF document text
    • https://gojefizabefav.weebly.com/uploads/1/3/4/8/134890321/toraxi-sibogi.pdfIn PDF document text
    • https://zagamujibagixon.weebly.com/uploads/1/3/5/3/135326067/zikox_makisexuta_gagawamutos.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/64e487.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/ea1e4feb3a20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/ryobi_3100_psi_pressure_washer_pump_protector.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 5512 bytes
SHA-256: 510f28281470af822a1383e5e01287bd253913fd58f196da6f006994b57ceb8b
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 11352 bytes
SHA-256: 18db5eb90bdf19bd5f99b67aa88200a9330c3a5e8b3f8871e8a464494806fd01