Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ab37969ea182e5…

MALICIOUS

PDF

81.0 KB Created: 2021-01-01 11:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9f5afe2a27ceb38b951d017e1a530ca9 SHA-1: 77cd1b1fa8c95d7487fc3c10e5147914dc21d8fc SHA-256: 88ab37969ea182e5a4825c08cadde30267241f86cd70cedb886d078e738ef079
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to redirector infrastructure and a link farm, indicating a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lure users to malicious sites.

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=dots+and+boxes+game+online In PDF document text
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/garazu-watejemopitad-jufegifata-warimegip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9790f0ddcd4.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/6049186.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/2835024.pdfIn PDF document text
    • https://zitilegog.weebly.com/uploads/1/3/4/5/134501444/6800129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcf8771a9611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/senodiw/allied_roofing_and_sheet_metal_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19bd020-74d7-488b-8d23-6f7742857678/79777997055.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/54141955359.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/48553435980.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/jezowivexaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/google_sheets_countif_case_sensitive.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/cell_theory_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 5044 bytes
SHA-256: c4a09801ca45dc96ef1389da5b3ba75eecec7522effa19cedd9b968d29b62b70
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10900 bytes
SHA-256: fbc7f4a048c6c5aa055a35959e8b05b9c7750b537de06635471f7a2b45855e5d
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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