Malicious PDF — malware analysis report

Static analysis result for SHA-256 4295c78e5f0402b1…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 21:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cab52d03e3da3ca550668b6ccaa8d416 SHA-1: 1b08ea8b3d508d75d3f6050a871343d9b6930ca8 SHA-256: 4295c78e5f0402b17ab2b0271faa3a10184a891de5f4b151bc4b604642488bfc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with critical heuristics identifying them as a link farm on disposable hosting and pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=girl+by+jamaica+kincaid+syntax In PDF document text
    • http://brosbass.com/antariksham_9000_kmph_movie_in_telugugl0pn.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_much_does_it_cost_to_fix_a_refrigerator_compressor.pdfIn PDF document text
    • http://getfreecreditreport.info/report_gbci_ce_hours4va71.pdfIn PDF document text
    • http://romeita.fun/devawowufil0dkoi.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/9480870.pdfIn PDF document text
    • http://domainlimax.xyz/e_myth_contractor_audiobookr36mo.pdfIn PDF document text
    • http://ita-women.space/varitinurabural8a2.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/voyager_2_discoveries_wall_of_fire_at_solar_systems_edge.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/5eb8d2df0.pdfIn PDF document text
    • http://idealicait.website/502029631120cnoq.pdfIn PDF document text
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/xudavevokuzababurik.pdfIn PDF document text
    • http://thecabinets.xyz/sparkling_gems_from_the_greek_rick_renner_onlineiv57r.pdfIn PDF document text
    • http://replyua.site/gajipg7v12.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
    • http://pikubub.onlinewebshop.net/how_to_do_the_google_thanos_trick.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 5128 bytes
SHA-256: c713347bbe2f221e9423762ab9f2f81096a02174aa9cabae0e6d793820615374
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 10436 bytes
SHA-256: 1b399419d52b2ea753b0c58abe1d4930cd81de5459809e48aec43a1352a3f821
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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