Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ec57362dcd8f39…

MALICIOUS

PDF

74.4 KB Created: 2020-12-20 21:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5d48619a80659e53c4f3fcf83c7dd7c6 SHA-1: ecb85d8be6a62291a2413e9e275c637a36c989fe SHA-256: d5ec57362dcd8f393c2595f7c77a4dea68d20d165a8b93fef973d639aad338cb
254 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 contains numerous embedded links, with critical heuristics identifying them as pointing to malicious redirector infrastructure and a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to shell commands, suggesting a technical lure.

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://ggtraff.ru/123?utm_term=bash+one+line+for+loop+file In PDF document text
    • https://razulusajo.weebly.com/uploads/1/3/4/4/134467314/venoxena_mozev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fca102ea10dc.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/24edecb5-af0e-44d8-a53e-3551dcf9e5bb/7080064464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d53b0a3-e569-4d92-adec-b7d17e62957d/bohemian_rhapsody_pentatonix_musesco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2884ee83-9dd8-468d-b0ce-71186dca3c6f/81073500059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afa68ee-7d22-44f4-86d2-73e1ed474acd/vuzibesezofoxuvusumafukun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350d8254-b0aa-4e49-8da3-e5b55f03418a/2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be7ac90-a072-4896-a50f-5b79089ee633/ignite_volleyball_club_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba615025-4294-4961-912d-076ec12c8ab5/kowixokono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd22420a-700c-4c84-a883-e7d6c8115ba8/77142427267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf882bd-3b24-4855-ace2-ff155b3976d3/batix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13f1637-1af1-4e6a-b8fb-f09acfeab6cd/89986179298.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 4100 bytes
SHA-256: 929c20a27326f29d76046e7765ac910534210a60d35c2290130d7b4476eb028e
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5036 bytes
SHA-256: b5c4cfe152e35e6f410ebed4bda529785ecd801849edbbfa8f6f06c582ba8776
font_02_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 11612 bytes
SHA-256: 4bb8b04235537a14260bfa3e5be86d04520e834535cf22c317ccc62b3a32cf7c

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