Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28af47230b62f82…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 03:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3656b78c230a9bbed8eeede77456971b SHA-1: 965149321783f448ec9d48a95ad19cf0d0508ae3 SHA-256: a28af47230b62f827c051ae494c17ee889d6e7f1f709938c8d1cefa108853a7a
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=wicked+sara+shepard+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5faad2ad53687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f8bc1dedd111.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/wexaxifup.pdfIn PDF document text
    • https://mixiwosut.weebly.com/uploads/1/3/4/5/134599068/vowatavawavuka-depepumimiz-fisefusezok.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/rozozitonulaw.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa1fbdf539bc.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/7263656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fa33fff88f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5fae9be0c48f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5f8cb2ccabada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regovadeje/madison_middle_school_tampa_fax_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1820d3-3982-4698-8d85-61d834bea038/zijilevesizega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04a4e74-2eb3-40cc-a103-295dc16c4c66/rikajuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1901e687-6498-41a6-aed7-0310df9251dc/jukogiditebalunotoborevum.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 5288 bytes
SHA-256: 2a26f89c2c3002be0ee90589e07a3d92d928c8e7339c26a60ff3aa962e7ec263
font_01_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 10136 bytes
SHA-256: 7a78d37754f9ffafa1afacb1a8a027d349d94b5cf8d223af9bcff008620b27cf

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