Malicious PDF — malware analysis report

Static analysis result for SHA-256 e957c91e219583f6…

MALICIOUS

PDF

83.7 KB Created: 2021-01-17 01:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f426ebd32314229e8125965a82d25ede SHA-1: 990184aaa5ab2b3dc48c0c12b723d9af8c504f9b SHA-256: e957c91e219583f6e1ef6bd00f530e7872e7149d8f22395b8af70764b6cac322
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely leading to further compromise.

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://trafffe.ru/123?utm_term=new+home+construction+checklist+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5fabcdff5a33a.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/petabusujijif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_5fd651d5686c7.pdfIn PDF document text
    • https://site-1168239.mozfiles.com/files/1168239/monkey_wrench_plumbing_los_angeles_ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5ffbc1f728c03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fe1ca529577d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5faf5edaa8ac0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fe23ac62d226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe49b5b22cc1.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/the_7th_continent_expansions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisik/fresno_bee_fishing_report_october_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

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_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 5308 bytes
SHA-256: 12616005a92e9b54bc300ad042bf0584afce38f67dd59de0149507a2106f301b
font_01_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 10404 bytes
SHA-256: c3f6d0d4ba31542ed7e7095fbd470d23acbd693936e9c5823b47fb901f2b1a26

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