Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8534006d6d46dc3…

MALICIOUS

PDF

75.1 KB Created: 2020-12-31 03:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b9d665705eeca8bbd87e0e39bed97e44 SHA-1: 94b4692866e46784e6bd75a31ea232b541dfb557 SHA-256: c8534006d6d46dc34cc998456a2a23afc941c13cc8578e669b997a458e503e75
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it links to malicious redirector infrastructure, specifically a URL designed to look like a job salary search. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the embedded URL is the primary indicator of a phishing attack, likely using a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?utm_term=senior+marketing+manager+salary+california In PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/7559263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fada4f917741.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/gficMhc/nokibupibasak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f939239525b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f8ffccc6815c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5fc9bacc6beb9.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://s3.amazonaws.com/wetevali/kiwusudamixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cef237-2d86-41c2-9b33-c815f0ef374e/gamulatirekorefisekado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a06bc70-51dd-4d44-a495-5bcd5e50a784/common_disaster_clause.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419197cc-7e03-49f1-b6d2-feb626af5712/59056725261.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 5260 bytes
SHA-256: 3d3a94e5c941e8eace6c244c65a842f96915ff5a2bb679350f1522305d52a969
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10060 bytes
SHA-256: ad357230551fb154362697d0ec0898c5baab59229c38eb59691dc06dadcfbaad
font_02_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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