Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad9c635cfabbf17…

MALICIOUS

PDF

85.8 KB Created: 2021-04-29 18:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 47b518ee022e479f0c2a091f87f29d8d SHA-1: 22e19a95fe84c1ca4c7853588da1087baab66b50 SHA-256: 3ad9c635cfabbf17aa4fd0f7faab3398cd8686175351ec6c77f8d4cf1859dc44
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=baby+girl+names+start+with+kee PDF link annotation
    • https://cdn.sqhk.co/detobero/idjhwhi/botodobonitemurofopuxapi.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/duwenipunokonag.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/8061933.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/wiiyjeB/rustic_white_night_tables.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/eiigeji/vifupenivufozabaferotagib.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/zowapaxonomemidudunu.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/4266949.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/wegugiriwomijejawuninu.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/zofuwaged.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/ruped-gobitaronobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/crack_autodwg_to_dwg_converter_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2b702f-0c00-4731-b73d-41a72adadc7a/74045331433.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_7e4c8122a1ee4718b956c0d8d9575167.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6b999e-edb8-4636-a315-556ce789c5de/how_to_study_physics_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/conjunction_and_but_or_worksheet.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_0bddda24d5d5410fb87d49d92ad23ce2.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_0aa1896d509d485f91343585c45b6cf1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/superannuation_guarantee_act_1992.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/gexofamixuxiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/mesasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b0a836-e02b-490a-96a2-98a4330b260d/72138041364.pdfIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_93bc8d8ae8c347278faaf1ed64400ac3.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_44d9af27ff6945ddaa943ff25850305c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 5224 bytes
SHA-256: 9c699c2b4a7358c52e9ae69c743787563ff1784c098805e11f3071c66630a78d
font_01_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 11048 bytes
SHA-256: da417806ca1727ff1679fd5128476c857da5dab7e7df022dcc46378c3a4c8ff1
font_02_sfnt_off00013b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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