Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0ce886683745ac…

MALICIOUS

PDF

75.3 KB Created: 2021-03-22 21:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305b001a09660d4db7a1fcf622258958 SHA-1: 03539ab88d9c7999871cd924648dbb51bf6bc672 SHA-256: ec0ce886683745acdb4ff91127ebf7e41317beece73ffa224512aac541942dd5
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 it likely exploits PDF vulnerabilities. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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=epileptiforme+aanvallen+bij+honden
    • https://lebamemodeli.weebly.com/uploads/1/3/0/7/130776101/refesalopo_dokeja_podovexus_zenodaget.pdf
    • https://majabowuji.weebly.com/uploads/1/3/6/0/136092793/d715977e87.pdf
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/gazowogofuj.pdf
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5ff6b0e6dfb30.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_602c238dda140.pdf
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/704fb1189.pdf
    • https://cdn-cms.f-static.net/uploads/4411682/normal_603a6e7c150a5.pdf
    • https://nulenedo.weebly.com/uploads/1/3/6/0/136084055/f661c3c9.pdf
    • https://cdn-cms.f-static.net/uploads/4485173/normal_603571cddd8a5.pdf
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/janutedarigab.pdf
    • https://bunozejat.weebly.com/uploads/1/3/4/3/134387809/cf97d51.pdf
    • https://lozepexowazabi.weebly.com/uploads/1/3/1/4/131409761/3340047.pdf
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/d19d61bcd.pdf
    • https://bukajovogasis.weebly.com/uploads/1/3/4/3/134340533/6959075.pdf
    • https://kabukarolezero.weebly.com/uploads/1/3/1/0/131070374/widoki-femuvuxam-novixew.pdf
    • https://dakuzewaki.weebly.com/uploads/1/3/6/0/136089440/9240dda0.pdf
    • https://cdn-cms.f-static.net/uploads/4481552/normal_603e9a2c430b4.pdf
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/domosavi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/553a146b-a736-456b-a053-aa2e1a5f59f5/how_to_pronounce_common_french_words.pdf
    • https://s3.amazonaws.com/gofilafixu/duduxagofaximuvunino.pdf
    • https://uploads.strikinglycdn.com/files/a1fdb8de-29a0-4742-a08b-e27f824ddcd2/what_does_a_unloader_valve_do_on_a_pressure_washer.pdf
    • https://s3.amazonaws.com/bogeguva/abcd_2_movie_mp4_hd.pdf
    • https://s3.amazonaws.com/mexijegedakol/fikovigawitufomusil.pdf
    • https://s3.amazonaws.com/liluvad/conversion_of_units_worksheet_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin
d47ed31920993649881893491a6b259cf26d4695f91357b661ecf0bed5f7e360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5336 bytes
font_01_sfnt_off0000fb81.bin
52ca83816bfa19fd64b1ce8de4d819009d577a52d7d7c8929c6b311fc5e67321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 10744 bytes

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