Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c3c4c592bf3b31…

MALICIOUS

PDF

76.5 KB Created: 2021-01-01 17:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a1539e888cddf4b018de607e3052d087 SHA-1: 1ce6eb4a202a51e144ffa5faf6e76f34b8377302 SHA-256: 28c3c4c592bf3b3153bcb7518c6821949beb907ce081045b95805f7d31d4cf7a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to redirectors or SEO farms, indicating a phishing or malicious content distribution scheme. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this. The ML classifier and ClamAV detection further confirm its malicious nature, with the primary malicious URL being traffickednew.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=general+motors+stock+news PDF link annotation
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/4e1171732ae79d2.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/6325279.pdfIn PDF document text
    • https://jerejadudet.weebly.com/uploads/1/3/0/7/130738914/femaba_lefipusalinasu_gubarakupobudir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_5fd7cf85a1f9c.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/171efdcf-ccd8-4f77-a32d-70d22b752a28/tetovipurimekusonilil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35322f40-7ae8-45f1-8bc5-55e41ca8b5bd/90276394677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe752db-e5cd-4b42-b5b2-96d985e8a994/mauldin_middle_school_baseball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7fe179-7a67-4dfc-bc08-26f7976acb05/lowes_grants_for_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337eae8e-024d-4a2c-8b1a-dbe49735646c/savasub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246ca47d-7ae4-434c-95aa-0a0d4efd0ed6/kosinobubufanowewebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1524eeb6-4802-4bee-9f3c-41c3c602a985/menajuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdc821a-c469-4fee-9eae-e97019e086ba/65475948239.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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 5132 bytes
SHA-256: 1707ddedcab6559372f49126b3aaf4c1f10994da54b7546cdf6db7081bb04ccb
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 11420 bytes
SHA-256: fb631c4a8d9ee66b15c8971a4a24dd4a74e84d68f70579c2904cf9da517e9f75

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