Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc06cf63900c163…

MALICIOUS

PDF

87.9 KB Created: 2020-11-26 07:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6607170b3b7daaa52747a524ca7ec5fb SHA-1: 1d9dc97af983de6e0e1a8539b936a8dfac38c30e SHA-256: 5dc06cf63900c16372798b35327b7738289f86a5b47ae10ef467a5d4128d8fde
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting a phishing or scam attempt. The embedded URLs point to known malicious infrastructure, including a redirector at 'traffking.ru'. The ML classifier and ClamAV detection strongly support the malicious verdict. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=questions+comments+concerns+funny In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5f9bad1a644c1.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/9524760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f968f74b95f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_5fbbfbf056830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f8e611ce774a.pdfIn PDF document text
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/4328632.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/feborobegibew/authority_letter_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ffbec3a-5e6b-4b08-82aa-b61a05982750/bakewudigixes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bbd89f-0e19-4f5d-a062-b17a27e5a002/bimug.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/puerto_rico_travel_guidlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76afe4a-13a2-4a56-ab5b-e0b4e3eca1de/comer_crcuma_fresca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61af3f27-f7b3-425e-8b40-ee0e6ac13095/manual_arts_crenshaw_adult_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d445d928-e9ae-4e90-8736-6081f4364783/devimapugulusumolago.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_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 4948 bytes
SHA-256: f75a9c25556e892bb01d0d609e13c8ebc8cbfb53b57a2ab998a22a66f127f287
font_01_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 11000 bytes
SHA-256: 86845b9b9ac88b5ecd8a3f25e1f480d7ce3902b9af896e6fae07f5af7c7b9496

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