Malicious PDF — malware analysis report

Static analysis result for SHA-256 804f0b49846a2dd8…

MALICIOUS

PDF

67.6 KB Created: 2020-12-15 05:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f9a0b820472bc00625b72cfece0dcf30 SHA-1: 1d3a85c94bf375bba753a28867d438f84690e9b1 SHA-256: 804f0b49846a2dd8cb56dc39e6ef36d637ace942e5d4c1ee6b98161bcd609f29
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a significant number of external links, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to manipulate search engine results or direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL findings suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=5e+point+buy+list PDF link annotation
    • https://buvudipugumop.weebly.com/uploads/1/3/4/8/134876529/mezol_bijiregalubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8a178c11e9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd0491b74034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f954c38decc3.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/cd8ec907-3244-4666-9c33-8b750863070b/mekililagarudemumafidow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f90b22e-10ec-4007-8fb9-6a203ac5b73a/sawosarivupobumojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def036e8-aa7c-4023-99e3-413206fac7e9/most_important_amendments_ranked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407b7483-b510-4501-a17b-7b4cb2402a55/75285163975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22912c7d-7a20-4a80-896f-3bbc3f269154/24066103955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c6c993-e9bf-48e9-abc4-86b539b77dff/janusz_woch_kulturysta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1662910f-39c4-49e5-a925-fc2251209ad6/removing_roms_from_retropie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80a5a7f-b128-4fde-837a-fcfb47f03359/peace_of_mind_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085c42e4-2da5-4676-a9df-a44f0b49ab98/11007104840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0eba80c-73b0-453a-871d-af80711a0485/xafapiwotevuri.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 4776 bytes
SHA-256: 0225efc34e214fdaaa97c5d5f052649f98b8b121aa728c30eb39ba49452beb01
font_01_sfnt_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 10928 bytes
SHA-256: d8c0d8a763d5272d5e7455e23ccbaaf8fe7092425570cf2d7ba8131af1600b2e

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