Malicious PDF — malware analysis report

Static analysis result for SHA-256 404b6599c889c776…

MALICIOUS

PDF

96.2 KB Created: 2021-05-14 19:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 77add3de09a8c3d50723f03e27845938 SHA-1: 42d9cc728ec7fd2afd322ab7ceecaab0d158e17d SHA-256: 404b6599c889c77640eb56d7f05f44ff1f1ac6cc152794efe34b5f8d07ce2b91
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of 'utm_term=dark+knight+returns+comic+pdf' in one of the URLs indicates a lure to entice users to click on the link.

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://fokemale.ru/strik?utm_term=dark+knight+returns+comic+pdf PDF link annotation
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/633467.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/pdf_agama_kristen_kelas_11.pdfIn PDF document text
    • https://fitezaxuju.weebly.com/uploads/1/3/4/7/134724711/padusoroxonujef.pdfIn PDF document text
    • https://lifeniwa.weebly.com/uploads/1/3/4/7/134716756/578397a.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/calories_in_dunkin_donuts_large_coffee_with_cream_and_sugar.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/guxogamewetuz.pdfIn PDF document text
    • https://kukapurabu.weebly.com/uploads/1/3/4/3/134375365/6145914.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/vuvutut.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/4479331.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/366a1484909c985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_8d6f8e2b8aeb4f2d8fdbab63264ed107.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_44e192ae8ac2430b8cdc15e410b98ef2.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_a9693c64fcdc46aba52ad1741e3d6ba2.pdf?index=trueIn PDF document text
    • http://tosurok.myartsonline.com/61834717554.pdfIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_9719706426584787a5df17c24a741425.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_79a06a3530784a509c17bbd0b2c09fef.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_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 5600 bytes
SHA-256: d332a9cf03378ed8e82942fcf4d054dfc43f5c535e16af210d5f22c4b56283a0
font_01_sfnt_off00014d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4F 11404 bytes
SHA-256: 52a9d015aded8a93e5e83d2a7138028d847a0b221be84b86764c069a70178a30

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