Malicious PDF — malware analysis report

Static analysis result for SHA-256 f754c4c7e72f9097…

MALICIOUS

PDF

66.3 KB Created: 2020-12-23 01:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 85547733bb4845b67b6889916c10ca26 SHA-1: bce36eef15deb8ddc0f89d2a40d4cc60fa947583 SHA-256: f754c4c7e72f90977659021ccf2bfe8fdbdf0075f61006cb6428d36745134929
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a URL with 'tiktok mashup clean' in the UTM term suggests a lure to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, consistent with phishing or malware distribution.

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://trafftec.ru/strik?utm_term=tiktok+mashup+clean PDF link annotation
    • https://siwikuzovusodig.weebly.com/uploads/1/3/4/3/134357046/2755093.pdfIn PDF document text
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/morumijedala-ranekeb-kamavude-tuxenupobovotol.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/gironate_vekerududut_zalewadinubez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fad917cde49c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5fb2bb3b78f9b.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/zetatirarisi_rowifo_wufizeta_noloduxeraxem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470825/normal_5fde8b8084fce.pdfIn PDF document text
    • https://bizidijekivaza.weebly.com/uploads/1/3/4/5/134502856/1043324.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/be422cd6-63af-47a5-b771-23b5562af816/byrne_dairy_jobs_rome_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35443b5f-ee02-49c5-8acb-c00ebd939c5a/childrens_language_acquisition_theories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554ccf61-2865-4ed3-b417-db806a72bcf6/making_comics_by_scott_mccloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4c9d71-ff8d-4bed-8bb3-b04429357602/moxie_salon__beauty_bar_montvale_nj.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5092 bytes
SHA-256: a6a3fce04e68961d318032c34a094fd7b014a1a376ca107dd2fec44b55a2f6e1
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10420 bytes
SHA-256: 6e2f4d18e9cd6bc09a2290f85c42f47bd44f7eb6274c67edcb29cb2fb7f43f38

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