Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deaf6553aa3e945…

MALICIOUS

PDF

78.6 KB Created: 2021-01-15 13:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5113d2e986b8eff9a9bafd6f2c1e82c7 SHA-1: 94266eb4f3252095bdc50c404f851be2efeeccc8 SHA-256: 8deaf6553aa3e94595b9cd73f5f7367661b013337ab935af11640317ed3c34da
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=sherman+alexie+superman+and+me+summary PDF link annotation
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/3c427e8fe8ce0ef.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/b169bd47.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/58hJugj/galaxy_defense_tower_game_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/ggvjbgZ/pulemipomerowitoxetiwet.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/penowavokakak.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/wuzave.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/W6ibhfO/eye_of_the_storm_idiom_meaning.pdfIn PDF document text
    • https://pevekalarukug.weebly.com/uploads/1/3/4/3/134318906/tusagexaporet.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/kuzofevoj-padisiriteme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/hostelworld_london_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/88094016710.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/high_voltage_testing_of_transformer_ppt.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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5472 bytes
SHA-256: 3bb1d9988d74e5514468d6a5387f4cb97a853699fb18dad10958c2836fd6cac1
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 11396 bytes
SHA-256: fa09b068f9a8c74e9f13e8cbebf6ac4577687b93ae2151e361372adf86da5f07

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