Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8862cbc932c370…

MALICIOUS

PDF

65.2 KB Created: 2020-11-10 08:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ff549bde58106f8d56b2da423ad31900 SHA-1: 1f9f4bcd374402647ac5d561fd4c773c795015c9 SHA-256: 6a8862cbc932c370b185e4fa2cc81f7aeb8a83a84130b7444bad2231297ef504
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?keyword=complete+guide+to+quilting+bh+g+phone+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f96819d896c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f99089927274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f9361a902757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f92d1f24c538.pdfIn PDF document text
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/sexibegusisarilulij.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/5277581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8d92f9c5a73.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/wijefizamomow_suvezelowegat.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/kedav-kalamovopomevem-wubafopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5f98c3c5811b9.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/pobipifojimid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f8b231f29ec8.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/8537873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5f99a00fac389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f8c288d337de.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/susopuzupure/finodurafonefolumobebetoz.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_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 5156 bytes
SHA-256: cf8d892078045d37575d03d3ab50583d22615f91741b29c81dff5aac06e4ace0
font_01_sfnt_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 9792 bytes
SHA-256: ba04f916823f21c5789218f1f6704e6f136376e71fa8321eb89345f7faf82b1c

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