Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c789c935ff34e5…

MALICIOUS

PDF

81.0 KB Created: 2020-11-18 06:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a72633763fddce59c6865c3cc14cb26a SHA-1: 7ccb320816aa4e4b3ee48fc870efb683b428cef1 SHA-256: 78c789c935ff34e518bc76ddc24c539849b27ea131589e9948fbf41c2fb33577
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 links to redirector infrastructure, including one with a UTM parameter suggesting a phishing lure for an "engineering manual". The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=revised+engineering+manual+ffxiv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f9e3c370e480.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/cdad76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_5fb4122c46c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_5faba896db576.pdfIn PDF document text
    • https://dugizade.weebly.com/uploads/1/3/4/4/134442098/4c9953aa.pdfIn PDF document text
    • https://muxoramosuzuveg.weebly.com/uploads/1/3/4/2/134266249/giwaf-tumimemajivaf-kimitanixed-sumotofibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5f95f4072d7e7.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/debap-wupejawu.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/576cb1a2-d2f2-4aed-995c-14647b4660f8/94688032795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9c11d7-1d71-4523-a2f4-12bf27cb8f77/download_stronghold_crusader_3_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff02d2c1-5881-403c-bfd1-f5843e99784f/telecharger_bescherelle_italien_gratuit.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_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 5364 bytes
SHA-256: 16e2b980961e377339cdf47e953217c8694060fdd5e2b5668fbc1dcdb68ea993
font_01_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 10692 bytes
SHA-256: 12341185de432f07a6d1d3b3bb335cb13591051dd68beaece55fd140edbb40e3

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