Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f669c03fbc090f…

MALICIOUS

PDF

70.1 KB Created: 2020-12-23 23:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8364aa48f31333df00d2b7f89a4f8cfa SHA-1: 9b96fcd39f90e2b8defbe4c45dee419d11e75c85 SHA-256: f1f669c03fbc090f1716f3c57f01b22b7c31260ae26006370161cbbe8bb5be86
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'https://cdn.sqhk.co/wotezowedo/0OihH9N/top_5_woodworking_projects_that_sell.pdf', suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'atomic structure worksheet key', which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=atomic+structure+worksheet+key PDF link annotation
    • https://cdn.sqhk.co/wotezowedo/0OihH9N/top_5_woodworking_projects_that_sell.pdfIn PDF document text
    • https://cdn.sqhk.co/xubenijevewe/Whbibhj/zisowozizatebowinilik.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/ihhhhkh/foosball_hockey_pool_table.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/wopanebo.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/4403826.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/ZzhfKhd/pavisugonoxulebeduni.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/RBjPZTm/cessna_210d_parts_manual.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/60314a21-3853-4cb4-9e0e-c32dc9277618/mevixakuxupolizojimafaxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9109ee-1f65-4211-a9bb-cbcd30acf602/60449529764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d84f921-3486-4884-88b4-f1d988c563bd/tabla_periodica_completa_actualizada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe77c3d5-df9a-4af9-b60f-8eb0489aefa1/canon_pixma_mg2520_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5952712f-3076-4c37-b45c-721d36a95b07/best_anime_avatar_creator_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3ca295-3bfd-441a-8c6e-289d4e919d24/jizuri.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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 5044 bytes
SHA-256: e2f5b20ca0c39f2c728bd7f22af25eb91674eb6dfcbe0fc7d1d9fe7f00cfcc85
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10376 bytes
SHA-256: 2c070800a7bd1c8b304fa1f36e0fd6aeabbb2e90bf72c6b8e55ccd57ec61ad74

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