Malicious PDF — malware analysis report

Static analysis result for SHA-256 904f33c48402ae9f…

MALICIOUS

PDF

145.3 KB Created: 2020-12-25 03:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c0ea9a6aaa8fc1541a610925cbf29cfb SHA-1: 4f731c9b71ac0a93db1dfabdc329cfc9c5c6ede9 SHA-256: 904f33c48402ae9f60f6cb3435f37f7df1f7bbc23e72b9ec2f5b258d99d2b54f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=how+to+cure+a+serial+killer+in+10+easy+steps In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5fcb30b416677.pdfIn PDF document text
    • https://bolewotimeri.weebly.com/uploads/1/3/4/6/134689798/3681899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fd94c60c1098.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/7085311.pdfIn PDF document text
    • https://cdn.sqhk.co/jagavibejabe/0jedAHe/business_plan_template_uk_doc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fdd8a7d6f33a.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/bizamesuwepe/limepifidefagaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8162c57-02a4-43b1-8ab6-0db0cb3cf7a7/revel_the_sociology_project_2.5.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/vogegopodupijupawalurexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c25ba2-a5fa-4f3a-84c6-d05a8f0e5436/sififebejogasi.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/upper_extremity_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad52e6ae-4c75-4eb1-9e9a-0d7fef96cd83/97448733581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad93fb79-3e77-44fe-aece-04de89a09353/windows_8_1_pro_x64_activated_product_key.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_off0001f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F279 5224 bytes
SHA-256: 46dbb98c2934a30298371fb6a418fd082eac0a25a1f659e79c1e56104d439dc5
font_01_sfnt_off0002045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2045B 10844 bytes
SHA-256: 616316c850507c4bb873b91794288ac56c4c5487a9b64078f438f9245ef601c7
font_02_sfnt_off0002298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2298E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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