Malicious PDF — malware analysis report

Static analysis result for SHA-256 4906453351d1981d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 02:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c7c5cc022a9ba2802e7ae6ea778f72e8 SHA-1: 2b9fc7aaee38decc27891acee72ec19c21e7d29b SHA-256: 4906453351d1981decdc2b6fdef46df8fc3fe31344dc83e98c7fd730ad4e16db
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the PDF's structure point towards it being used to redirect users to potentially malicious content or phishing sites.

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.
  • 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://crophysi.ru/award?keyword=how+common+is+child+trafficking+in+the+us PDF link annotation
    • https://cdn.sqhk.co/jadidawa/BiaHxjh/home_depot_manager_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/gcjfghZ/hematemesis_vomiting_blood_in_dogs.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/defemezifekufemapatejexox.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/wewukudikofiwerunu.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/chaojdo/52511857163.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/hYwBgck/tufonewobip.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/A3Njjgi/cartoon_plus_size.pdfIn PDF document text
    • https://xonasiwebe.weebly.com/uploads/1/3/0/8/130814782/a2df377aeac44.pdfIn PDF document text
    • https://womukowewefe.weebly.com/uploads/1/3/4/8/134889771/6326077.pdfIn PDF document text
    • https://molavose.weebly.com/uploads/1/3/5/3/135350427/gatoberojujeri.pdfIn PDF document text
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/gopokima_satevugojilo_gawefu.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/daronupiz-riligumuvejaso-lasib.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/jhdjehf/zebujimedoba.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/eoicieU/dodevemolaxasitejegevenop.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/85581156999.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/jajesosusame.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/mumezebemad.pdfIn PDF document text
    • https://medlineplus.gov/childabuse.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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5552 bytes
SHA-256: 7a3302f752ee1777b47b1904e6497f41d968100a945694fcf95458a1c8b0274d
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10568 bytes
SHA-256: a768f3133393e4b86e136aa000ee49252e87c5f3ceb34bdfcdb45e508ed44be9

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