Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9d7cfa9761e932…

MALICIOUS

PDF

74.1 KB Created: 2021-02-26 00:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a66bb3e3a9f8eb6961077fd6e614115 SHA-1: 23f8e9b8e4ea1927546c54363fb026cbf01a193e SHA-256: ca9d7cfa9761e9324df58cca3fa816eb6c5686ad4e07d7e2984467192c145c7e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and ML classification strongly flagged it as malicious. The presence of external URIs and the overall structure suggest it's designed to lead users to potentially harmful content or exploit search engine algorithms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=la+casa+de+los+espiritus+pelicula PDF link annotation
    • http://finonit.mypressonline.com/annual_feng_shui_cures_2020.pdfIn PDF document text
    • http://foodguideblog.com/riposte_meaning_in_tamilasf33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601bfe8a95400.pdfIn PDF document text
    • http://puwisagoki.22web.org/35344695750.pdfIn PDF document text
    • http://zogoxadaxagan.iblogger.org/guzilobuxixalugod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6034ce83cd97f.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/48405627785.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/8151883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5fe9f2324a878.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/naxodowixokupira.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/32098113441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_601b930646143.pdfIn PDF document text
    • http://fisogik.iblogger.org/the_vampire_diaries_full_cast_season_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450250/normal_5ffc88dbadd2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipezanegasan.rf.gd/how_much_does_a_mini_dachshund_cost.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/graco_duetconnect_swing_and_bouncer_batteries.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 5008 bytes
SHA-256: b729fc9d91584bd9bc79bc3b5f78464f1ee1a8a3d73a63de4155bff5a7604560
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 11488 bytes
SHA-256: e1de7483afaac90d7ba4aeccb3d794485928e0d699ba97425eb8508676bd060e

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