Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9843aadc06ee88e…

MALICIOUS

PDF

72.8 KB Created: 2021-03-10 05:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f7a1ce9b9a3f35d5a8986f0571fc438 SHA-1: fb1ae107cbaa40c71805b20368a9176f72c53dfa SHA-256: a9843aadc06ee88e38350784b48998e1d8450768e5418d081b6205421d3ad200
196 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/aws?utm_term=how+to+find+angle+measures+using+triangles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476135/normal_601ba3da3490e.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/rulewop_suxobonakimos_riparam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fe964fac64c0.pdfIn PDF document text
    • https://dubakaxejevam.weebly.com/uploads/1/3/2/6/132696109/jolupozajiketikag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60240c43e601b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_60079ecc3aae9.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/6G5Mn7c/asteroid_belt_facts_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/FFDvhbb/best_photo_editing_software_for_beginners_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000dff3.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000dff3.bin)
    • https://s3.amazonaws.com/xukirizugukugi/raroxixexolakixek.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/37308490698.pdfIn PDF document text
    • http://dinixebun.epizy.com/catering_contract_template_uk.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_14fc8ee2fab848018637fe0edd390139.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/broad_form_collision_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/gubekeduf.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/28887464907.pdfIn PDF document text
    • http://foripoj.epizy.com/jinosejunatolexu.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_0bc1f3e6326249d18517bafe74b864c2.pdf?index=trueIn 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 extracted file (font_00_sfnt_off0000dff3.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 5280 bytes
SHA-256: db9017f963a6c5f64989e75f480d22a06adaf28b199db58d42c5fe533c063994
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10600 bytes
SHA-256: 0088ddb5f6f315aef4f7f58da0be051d4bf8754c74ef36ac4d644a53c593126c

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