Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8706991b74c32a5…

MALICIOUS

PDF

87.4 KB Created: 2021-06-02 00:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d7d1ead2f9b26c34e8bc439a55bcb455 SHA-1: 8eff193770536c2e96265f541e43f54463ce13d4 SHA-256: e8706991b74c32a59e11dd751b2909f415c0ab3ca8ad4e940649270bee6d0744
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=bitter+harvest+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412591/normal_601a3df4106b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393349/normal_5ffa73eea2031.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/9331873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6033c57e39c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_605d9e14a44b9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379476/normal_60affbe139d65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5ff6672dbef47.pdfIn PDF document text
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/5533235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5ff502068c7e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5fcb30827cce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_603b50e4f30df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_602af727df261.pdfIn PDF document text
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/9050867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_5ffb954d7598c.pdfIn PDF document text
    • https://terurudib.weebly.com/uploads/1/3/4/3/134381327/josepekugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_604f044a1486d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_603fc3008e835.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/4791101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144427521/dd_pirate_ship_map.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144416097/vida_y_muerte_en_la_mara_salvatrucha_characters.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144467157/what_oil_goes_in_a_ford_focus.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/my_stupid_boss_1_indoxxi.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_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 5300 bytes
SHA-256: 1ffbb3335c759d68082dd5c2da10e7cd0e7c04ca7407870f2d6d67a4b17dac7f
font_01_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 11388 bytes
SHA-256: f9e9f143325f3258f04a1bb54159def619a08cc9906471e9935f44d70f71bb49