Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf3e834bdb1abb3…

MALICIOUS

PDF

82.9 KB Created: 2020-11-25 21:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11b1d34c8f7b9f67c514af94677a5f40 SHA-1: 63a941c67aed243c793645a76db4ac81982a3bd1 SHA-256: 4cf3e834bdb1abb3b7062a7dd17915b23d3238224b64b909d64d9c42e1687b90
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://traffset.ru/aws?utm_term=free+holocaust+worksheets', indicates a deceptive lure to drive traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or ad fraud.

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://traffset.ru/aws?utm_term=free+holocaust+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5f944c7e29691.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/weranelomaxixefozalu.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/9685648.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/gejiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_5fb990b280571.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/wizinitukenere.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/9152782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f8bd8c234eeb.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/nidusawivafin_zebaxu_riwiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_5f9d157198ec9.pdfIn PDF document text
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/buwotipijoteko.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/2783ad8f-9f94-40c3-85c0-3f098bdb6f0d/xiwanidibas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b94d17-4fbe-43c2-acda-4bd336cafb60/betatoraliwurugoxazegido.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 4724 bytes
SHA-256: 6fc81f9382202fb68ac92c80843cd6e21bbd663dd32efc6f4d2da953884560c7
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10312 bytes
SHA-256: b0f356fc3d1d4b50cac9d777a106ffd44d5a77e35bb520b45f70dba458b6ea1f
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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