Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5cd179238580cf…

MALICIOUS

PDF

64.3 KB Created: 2020-11-13 03:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a5002c5593a2f1955a3216904870a09f SHA-1: e4ca002a405e87c09c7e4bd9d15d503cfeaf5bd7 SHA-256: cd5cd179238580cfde42fe54d8374fd5b21a57dd909b3d45688004e50e82c952
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to other PDFs, which is indicative of an SEO link farm. The primary URL, https://trafftec.ru/123?utm_term=carpenter+cup+2019, is used as an image lure, suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or trojan delivery mechanism.

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.
  • 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.
  • 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/123?utm_term=carpenter+cup+2019 PDF link annotation
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/denesanijibep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5f9de1b88c6d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_5f91c5f9a2082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fa7db87f2a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5fa8f4941e2f9.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/3556218.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/nanatiju-kewisakedukukeb-bejesore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fab33674c594.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/polojuliragam/muvodufawagolew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcb6c3f-c0d4-45a5-af17-0f22e6e69de0/3560075420.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/fedakafekopufavefo.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_off0000be4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 5104 bytes
SHA-256: 3acee74dd3d42f6524052dcf8f76202dfbec3c289401bf60f0ac8fe1cf495642
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 10932 bytes
SHA-256: dddc0e9fbf905885d20d8a44846e7b7b4bff74b693b7ccad397c74d2cd743c43

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