Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81250bc3285dd88…

MALICIOUS

PDF

62.2 KB Created: 2020-11-14 21:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e0e9dfc441de48f8a94aa11cbbc09570 SHA-1: 3ab8425693adc17326492aa6d012439fc131425f SHA-256: c81250bc3285dd8889ad6a0ba99b08810424f2481ba06ad9b315ee82a3a9e196
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, such as 'https://traffking.ru/123?utm_term=the+art+of+public+speaking+stephen+lucas+10th+edition+pdf', are indicative of a lure to a malicious site.

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://traffking.ru/123?utm_term=the+art+of+public+speaking+stephen+lucas+10th+edition+pdf PDF link annotation
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/fovun.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/2228289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5f99c1439fe82.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/daropawemij_fupoxel.pdfIn PDF document text
    • https://defifipak.weebly.com/uploads/1/3/4/4/134442047/susezenekav.pdfIn PDF document text
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/4239534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/104ec9bf-e817-43ec-84b2-db0ab68a9e0e/27052559164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050c3fc4-1b68-43e0-be93-8b8e0b5e699e/977085503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d42943f-628c-41b4-9f93-637a116fa250/west_point_elementary_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004367af-82aa-4a0e-b51c-45300bbdf794/tefexegajedadixupomesaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63836add-daf7-48f2-96fb-6884aac683c6/77115297358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e1af48-b8a6-401f-bff4-8bfc75317bb1/php_notice_array_to_string_conversion_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6eae2a0-8490-4938-b729-c39292642956/55813199507.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/jabowexalodoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce994d68-4bdb-4665-8499-0fefbcf5a434/pedulanesize.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB709 5764 bytes
SHA-256: b95d442cee13d830097e51afb1973a14a72fd23512ec13db50a09594098f7a48
font_01_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 9692 bytes
SHA-256: 5be80465cf7ae2931181fa96e576650e4ff738818e86970bd9bdc238e6505627

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