Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a8ea75584251e9…

MALICIOUS

PDF

57.5 KB Created: 2020-12-03 19:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c24e74b6fb345de5458b3e1802753972 SHA-1: 9b21da1a18707de90211c47ff90ac0c9e7785e0b SHA-256: 78a8ea75584251e9027557e45c8ab677f08ed8173067dfc70cbfc74b06529b3f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging an external URI to 'traffine.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffine.ru/123?utm_term=dassel+cokato+schools+parent+portal PDF link annotation
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/6324858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5fa906a6ef110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_5fb7b7f68df92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fbb7025f0b3c.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/f0cf9706-6f88-4eef-8385-cc1079e4748f/transformation_of_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bef8c1-6e20-4420-84f8-cfcefb3a6967/92957999470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ecb74d-bf99-42aa-9c60-b60a7b18151c/88793391571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6525501-73c6-42ea-98f1-0d5ed95aa6df/tukimixekawefarovabulivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93f4eb2-f111-4c9c-8a67-9124a3cabc3b/reebok_basketball_shoes_shaq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784d5e24-3f64-4f36-9bbc-d8e45bd7e55e/85637952996.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/the_sims_mobile_latest_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdbb3b07-d53b-4905-9ba7-96affd448545/are_statues_art.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_off0000a79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA79F 5084 bytes
SHA-256: d81585b5246ca3541a270718eda9921f8b484f34e9d29c32d5b47a4c92abc869
font_01_sfnt_off0000b8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EA 9008 bytes
SHA-256: 8f6b5ec5b4a2410c94fe62c5994d6de3d4498e4e3129337e446aa6c1f6f383a1

Open this report in the interactive analyzer, or submit your own file for analysis.