Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728c28a74bc76ee…

MALICIOUS

PDF

72.8 KB Created: 2020-12-06 23:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2dbed9e96de351dd32faa48379394b41 SHA-1: 9c68f2a0d7c992ac99a247a12468691602e07ae2 SHA-256: a728c28a74bc76eef67b6b067999fc426c80c1a8c77920bc244d109a25386e5e
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://trafftec.ru/strik?utm_term=pictures+of+instruments+used+to+measure+length PDF link annotation
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5acab582ad41.pdfIn PDF document text
    • https://zezexofoji.weebly.com/uploads/1/3/4/3/134344156/3a93919bc7.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/27a9ad3c-87a1-4815-bdbe-ba2de25a4668/devil_in_the_white_city_quotes_part_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d38e5687f52b6b8dad8d/t/5fc9b9a581b71b408594947b/1607055783299/100_days_of_summer_safety.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a3f3d26ff1194f7eeae9/t/5fc49c257acac6192a53c17f/1606720549720/kenworthy_lane_northenden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20cb1951-f92f-4c49-bffb-1cf7c364640f/19172080352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f28d402-77de-49c8-b29e-01375a120362/werenewumetefikifum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350d8254-b0aa-4e49-8da3-e5b55f03418a/2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c37f1da-0653-4e62-9485-90807f15aa04/fawebisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04c0bce-22eb-400a-a60b-2a272c051210/81430791894.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc587e7affbf90a6609e8ed/t/5fc8a72eee804a17a1d6a111/1606985519347/air_hockey_free_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a3ba21-6fd5-4702-b796-efd2bdf0667b/tv_repair_in_riverside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997185a1-b6ad-4920-9c36-bd6a8b628d93/12002852668.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 5436 bytes
SHA-256: 74222ab6967fc50941e68e3b42eec4b17e17bc6aa77f3b50a4315e266b9e1c70
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 11048 bytes
SHA-256: 1b44fdadef6068308075bd603b73b018825e4fb6504ef76031b7600a9ad394f8

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