Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1468dffc2604fc…

MALICIOUS

PDF

67.9 KB Created: 2020-11-24 08:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38af0436c1a49852beb6447ff1d070e8 SHA-1: 1f5e75d36b8b50308c9c49a067aeff86b56be50a SHA-256: 7b1468dffc2604fc27a3277c2eb115518d07543c4c097e47a1af11a8e662b4c1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to drive traffic to malicious websites. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristics suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/strik?utm_term=the+good+wife+guide+1955
    • https://rasetevipumi.weebly.com/uploads/1/3/4/7/134714044/fezidefenine_vunibixaguv_fewukosuwej.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/374977.pdf
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/8238468.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/jimuki-tisogasap-zedakirolulevu.pdf
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5fb72f8ede8de.pdf
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/1957626.pdf
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fb4fb2c1ace3.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/8c42e885bf419f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pizexopenaxu/22575634289.pdf
    • https://uploads.strikinglycdn.com/files/d69e6f5e-5505-42e9-8d7c-8864ff8056a2/pro_con_worksheet_fillable.pdf
    • https://uploads.strikinglycdn.com/files/0e6f9841-995c-4084-abc0-66b21d5b0cfe/ruger_mark_iv_pink.pdf
    • https://s3.amazonaws.com/jezobasit/kazalabeniwikavufu.pdf
    • https://uploads.strikinglycdn.com/files/af8c5bf5-1ba1-4ac5-bdc7-ee7199eead22/the_help_book_buy_online.pdf
    • https://uploads.strikinglycdn.com/files/852cbc6f-6bb2-41d7-93a5-06ef564824b5/jexelafesevaro.pdf
    • https://uploads.strikinglycdn.com/files/aa95d915-68f9-48fe-9d6d-972ed6b4504c/rowe_elementary_school_illinois.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0c.bin
a5c112c9f3b3bf83e68ec05da7e9b157f4978d51c36b5a83357f55f365a97af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 5028 bytes
font_01_sfnt_off0000e050.bin
c5ac5fabc83150fe32cf077fd60703173a9e4db972c80f9e7ceea00d0ceae8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 10040 bytes

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