Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd1c5361383eccd…

MALICIOUS

PDF

62.6 KB Created: 2020-11-27 22:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ad4990db479204aeafd6de5d88a3ae29 SHA-1: 28febe249a92cde07b4284456bb052d331d51481 SHA-256: 7cd1c5361383eccdae12b22525e3008cd6d6bbbf56f7c2548991bd874664d725
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://traffset.ru/strik?utm_term=secondary+math+1+module+2+answer+key+2.5 PDF link annotation
    • https://xujupemixupu.weebly.com/uploads/1/3/4/7/134745759/bolapirezuduv-nexoxite-dolukexutiwi.pdfIn PDF document text
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/tefedogafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5fab1c4816088.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/7059084.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/mirowixeki-totid-vubelusega-fumetogifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5fb66618eac19.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/mebosebajus-jugebezibelu-nifab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5faad49786a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f96a61c39665.pdfIn PDF document text
    • https://lubuminovek.weebly.com/uploads/1/3/4/5/134590555/9743874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fa152b33134f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5f8fa99a8a618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 5880 bytes
SHA-256: 6100c99315a4fbdbf6b4b952f2bdb2d26de55a0004b1900624ccd85f28def0ad
font_01_sfnt_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 10128 bytes
SHA-256: 43d6cd63f08ab53ef81f9ef5834ff77fa51666b5405ab462ea4f5fa52f8e9148

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