Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dfa3dc51fcce51…

MALICIOUS

PDF

80.1 KB Created: 2020-12-19 10:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7458374e409353af0bc783438334131f SHA-1: d79feadc6d60bf3d0728ac14eaec25dba669fe2f SHA-256: 26dfa3dc51fcce51f6181a56f9ebe8c46bf3dfeece37a791c65e444776612739
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a link farm of 22 external PDF links, suggesting an attempt to direct users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=nile+c+kinnick+high+school+yokosuka
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/a9f43.pdf
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/6634122.pdf
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/1206659.pdf
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fd68a064d343.pdf
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/tovododelijubew-netiz-sekikatamijazej.pdf
    • https://pivokobofu.weebly.com/uploads/1/3/4/6/134648089/fb4f580129.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotizifime/47753319651.pdf
    • https://s3.amazonaws.com/bifamomove/33897090993.pdf
    • https://s3.amazonaws.com/tekujel/callejon_de_huaylas.pdf
    • https://static1.squarespace.com/static/5fc714e6c89b935f15e02e5c/t/5fce9834b2fea306d95e7d75/1607374900362/funny_alexa_alarm_sounds.pdf
    • https://s3.amazonaws.com/kawotexulozax/wibirenubokukomalurujod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caaa.bin
0cd1dea900e970b32d2bd0abc61a9eec47ab31e4b655c76295809fa799b118c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 17252 bytes
font_01_sfnt_off0000fe69.bin
e9e43e6583046b34c0619d32fd3422ff703959a5fb794e75b35cc2654f090949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5100 bytes
font_02_sfnt_off00010fd8.bin
045bd312d0a883c6d98a71a3fa2ac0904f2cebcc790df99d2ff3097b6cbd8494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10432 bytes

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