Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde83f7d9ec96a6e…

MALICIOUS

PDF

65.4 KB Created: 2020-12-14 04:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 77d9155e52175cf1e2e76b6981d276f5 SHA-1: 2e1417b914ec967e954fd5a5e56130140d923466 SHA-256: fde83f7d9ec96a6e4d99532223f790ec88a137abd88a672f46d9c2c75d3afb1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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://trafffe.ru/strik?utm_term=quality+control+manual+example PDF link annotation
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/0f6314c9aeca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fa9356f95fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5fabce7dc7673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f920dca6fada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5fbd12e3dddf3.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/b1164224-1340-4dd1-8e2d-3af6410c5ced/mamesetuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8474c456-0d17-4640-8161-49ab707fdfd3/54195362749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fdf03a-058f-4495-bdfb-722e2bf9e0b7/javise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6d464d-06c9-478a-b0a2-6f01bb18f5b9/how_to_cancel_friend_requests_on_facebook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54de5d26ff1194f911033/t/5fd08b5ba040431536c10573/1607502685547/break_it_spill_the_glasses.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/accomplishment_report_in_filipino_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd602a93-cd74-4879-b19d-ea60cdab48de/letra_de_la_cancion_chimbacalle_wiki.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_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 5132 bytes
SHA-256: 28bbcfdf39df01e06a7668b0db4b61708382b738dff88856e05071797f499261
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 9940 bytes
SHA-256: 46b4607d09fa485872d94be5ddb49d4f25522f3df9ee5de78d6d5e72153a832d

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