Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb622de66c7b40…

MALICIOUS

PDF

77.1 KB Created: 2021-03-28 06:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 15be4c45f3dbfaa262653470aab68191 SHA-1: 8c759a7031533144475e9c3c94ffa4529545210e SHA-256: 9dcb622de66c7b407873d1d217f17bed3638846f3fd9b5f339a3e39473147c23
244 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, many pointing to disposable or suspicious domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the detection as a phishing trojan indicate an attempt to lure users to external, potentially harmful, 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
  • 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://dafemum.ru/123?utm_term=farm+animals+worksheet In PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/megaro.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/adjectifs_composs_anglais_liste.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/cf09adeec.pdfIn PDF document text
    • https://zuxigazazopak.weebly.com/uploads/1/3/4/6/134688762/8395328.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/4234174.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/58526946771.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/ridiz-kaxalopak-nigekujikilefat-muremokatuwapo.pdfIn PDF document text
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/sasoviwebigadi_sukupuwasit.pdfIn PDF document text
    • https://gudimutukadido.weebly.com/uploads/1/3/4/6/134648046/zotakonefuruziz.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/article_370_free_download.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/kudimeno_vawikek_komif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_c23f704e6188484f86c49db635a6aa0e.pdf?index=trueIn PDF document text
    • http://lugimeviguv.myartsonline.com/gegekivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85388b4f-994c-4731-9e17-081d7b892e23/24974101587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f7532c-860f-40e1-9bb0-820fc0d6d687/does_the_health_department_call_you_when_you_test_positive_for_covid.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/80955340661.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_ec59a2e3c7be45e3984b3cfb81ab15f3.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 PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 5036 bytes
SHA-256: aa349772837ed6eaabbc3827d6d20dd9b91a4a64210d0c532d282d83a9bd2e7b
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 12124 bytes
SHA-256: 37acdbffffec61b697a9708e9bcb53911c5832390983ba703287b2d63a9c900c