Malicious PDF — malware analysis report

Static analysis result for SHA-256 2136debed0810afd…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 16:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e08bc85818134d7a5e8a22130888dece SHA-1: 2b14ef4d37a3aabeff826b79696983c9cc854c5a SHA-256: 2136debed0810afd2e01dcd6d70f10d16684e2d005a327784b98310fc6acc1a3
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 ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The document body is heavily obfuscated and does not provide clear instructions, but the presence of a large number of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=biomedical+engineering+bridging+medicine+and+technology+2nd+edition PDF link annotation
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/nosuxirinovik.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/cihjgCY/classroom_management_strategies_elementary.pdfIn PDF document text
    • http://nextauto02.ru/bhumija_janki_janak_suta_sita_songuhj88.pdfIn PDF document text
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/79a126a57789.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/iebmQia/red_sunset_maple_height.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/gfAtDpl/15994936434.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/hCqGidg/bawivofosanoberuluravata.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/djgjbMH/galaxy_siege_3_wiki.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/a7229f.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/vgeicgj/freeze_transunion_credit_report_free.pdfIn PDF document text
    • http://raisinshq.club/arctocephalus_australisyctz9.pdfIn PDF document text
    • http://libertinemodels.com/little_panda_runxg5gy.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofebiziv/DgcNqYY/joker_ringtone_download_mp3_zedge.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/6268959.pdfIn PDF document text
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/kumemekakajewarik.pdfIn PDF document text
    • http://beamorem.com/25230241511i4kqk.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/cgcjCHy/gusaxitaxar.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/W6Lijhj/ropogizanuzevazog.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/zewuzus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 5596 bytes
SHA-256: 66e347aca41d2ddd751e061af980a24bc39e861713ec66bd9f1eb3914998dfcf
font_01_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10600 bytes
SHA-256: 2dc5e1c16608c28e23cab02cf5ad81894e7fabcbc88b3e85f81b551c0fdb51fd

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