Malicious PDF — malware analysis report

Static analysis result for SHA-256 166569104100da12…

MALICIOUS

PDF

67.1 KB Created: 2020-11-16 12:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e20888f794f8714d192b110b9faeb2d SHA-1: d66f67053e88ae288ac77e033571356c1d9cb7f5 SHA-256: 166569104100da124836bfa2b5fe9f7db270f55ca273eeb7161dd8ff48d2099b
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://trafficel.ru/123?utm_term=mixed+operations+with+polynomials+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f8abc83608b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5faaa48e3a110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f975eeb41b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fac573792bb2.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/7527281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5fa2494e430e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f9203c8d9a7a.pdfIn PDF document text
    • https://tojopuxibo.weebly.com/uploads/1/3/4/2/134265943/zitozi.pdfIn PDF document text
    • https://xeveguxugagu.weebly.com/uploads/1/3/4/6/134600238/mufekid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874cfa38d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5f97994ed8d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_5faf50bbc2f0f.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/c5a4a9c1-539a-45af-b9ff-a754fd693c73/professional_transportation_inc_driver_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9cbad2-c551-480f-b242-ccf0c797e4b6/gym_candy_book_essay_recommendation.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/difficult_airway_society_guidelines_2018.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_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 5532 bytes
SHA-256: 681350ea8130f746c7ad516d971560d57547ccbe194082b7a066ffd69f35220b
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 10768 bytes
SHA-256: f044be42ef9909ab7834c7a459dd1cbb1b4da6a994fc0dbd96c6a62a3d236aa5

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