Malicious PDF — malware analysis report

Static analysis result for SHA-256 831b51df87cb35fc…

MALICIOUS

PDF

68.3 KB Created: 2020-11-16 18:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 128f4e3a7ab90cccf952d819d2bec5df SHA-1: 9cda09052a5f1b975a0d88011f059aaff1b827e1 SHA-256: 831b51df87cb35fc008000fb0550c03b9152e9ab617cadc6b815188211208088
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=ni%25C3%25B1a+que+nacio+limpia+de+pecado+letra PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fb2a00d7c0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5f9dd23b3273d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fa6ddea4c897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f8fce6006072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fa5db281ad59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f89fd6ccf7ab.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/bazenumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8ec4bb8cd48.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
    • https://uploads.strikinglycdn.com/files/22a78602-b724-4c6e-a067-357bb293547a/tesezulavuxer.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/e515dw_printer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ddb2a2-d618-4d10-87d2-cd6449754ede/the_birds_and_the_bees_full_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd582c53-b230-47dd-a8c9-59d5547f8c08/80387985484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f642ed-7529-4c6d-9912-30e369ba95a9/pufowapob.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/compton_college_spring_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd93cebc-eebd-42a2-99b4-faf483d9fccb/31227242959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f55883-3910-4b44-8ae0-c073cf5e24a9/64890007479.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 2

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7C 5232 bytes
SHA-256: e061e85d828bb599b42ad3548144948a9faba04a2edc24e94439d49a4203492d
font_01_sfnt_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 11544 bytes
SHA-256: 793cae0374a29980d0ff826838e6e4ff98c620ffaa4f42eb4584fdc36ebf26d3
font_02_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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