Malicious PDF — malware analysis report

Static analysis result for SHA-256 2874762afc0aa0a5…

MALICIOUS

PDF

79.6 KB Created: 2021-02-24 04:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: aa9a08f7a1e102324efc76a27ea27826 SHA-1: 6fd80e9834e546bc6046b5515e760d3a0d412d68 SHA-256: 2874762afc0aa0a5f792a0067aeec360704a351ba03a2ddb1118453d3c7cc163
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The primary URL identified, 'https://jacksth.ru/strik?utm_term=2006+bmw+330xi+common+problems', suggests a lure related to car problems, likely intended for phishing or malware distribution. No scripts were extracted, but the extensive link farm and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=2006+bmw+330xi+common+problems PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fd08ecb4c48c.pdfIn PDF document text
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/6618228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_602306f242acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_5fda38dbafd42.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/9221742.pdfIn PDF document text
    • https://xodebizig.weebly.com/uploads/1/3/2/6/132681497/gepikur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fefccc21efe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60306b9426f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5ff2ac1099ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_60174df983b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_602184bda9227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6023741307d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_5fe6f45c0f91a.pdfIn PDF document text
    • http://guwilos.iblogger.org/explain_latter_and_former.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toduwez.epizy.com/zonawufoleluzaxomewidazi.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

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_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 5668 bytes
SHA-256: 2092145d5a553f82f0e39657e11ba12c41339882519fcac01456236d93229719
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11252 bytes
SHA-256: 6add3e24e7d0f0c247cd85b82bf2ac4e0f4961c9b865ffdc52f9065f84d9a363

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