Malicious PDF — malware analysis report

Static analysis result for SHA-256 5651b3b6ab09a85d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-05 12:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 85c978ac606f43d63d8450de658d375a SHA-1: 73c62747e886106ca55885fc944e39fd1319c527 SHA-256: 5651b3b6ab09a85dd27ee9c61f0db22c99ab1dd9fb0e666e81b1e7033cb73155
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The document's structure and link farm nature suggest it is designed to lead users to malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample.

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
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=exposing+the+spiritual+roots+of+disease+pdf In PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/goxuxopawiwasaxasiga.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/880793.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/detixa-mugixogoveko-bafuxas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ff95a3349ec8.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/d1bb20090526063.pdfIn PDF document text
    • https://xapawijumoj.weebly.com/uploads/1/3/1/3/131379373/7103443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5ff8c3625d72c.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/selobitobaneg.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/a66d216a96.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/solonebosop/beginner_crossfit_workouts.pdfIn PDF document text
    • http://bunurakugixopa.rf.gd/86867328972.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/exponential_notation_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/weber.pdfIn PDF document text
    • http://vuxubeso.rf.gd/kulfi_kumar_bajewala_betiyaan_song.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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 5328 bytes
SHA-256: ae05f2afbfe4b60c996ed86dbdb0edd63c1105ae876e8abdebf187771539d76a
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10620 bytes
SHA-256: e43b0af471177cc12b2b6058257521ef3ca5d7864ae77df0c033cb0f9e63a1b2

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