Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e803732802dfbf2…

MALICIOUS

PDF

80.9 KB Created: 2021-04-09 20:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ec99b9b6cb7b71ec62b4b962ed21cbb SHA-1: 0bbe0069062128499e248638a9250c568521e223 SHA-256: 3e803732802dfbf204bf5c2609de7e9b44759a92cf1f89d003630798d05c0d07
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to redirect users to 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
  • 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://bologen.ru/strik?utm_term=how+to+pair+echo+buds PDF link annotation
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/kunejidoxuw.pdfIn PDF document text
    • http://site-shop.xyz/momeji3xut0.pdfIn PDF document text
    • https://jofetafoba.weebly.com/uploads/1/3/4/4/134485710/fadokozid.pdfIn PDF document text
    • http://stankovit.ru/mefobokexu8oljp.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/audio_lingual_method_definition.pdfIn PDF document text
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/54829b6e3.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/kipireguferoravip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_33335d5d662048758d01645e827ccfaf.pdf?index=trueIn PDF document text
    • http://lifobem.myartsonline.com/xuvozuxijibevedaberowo.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c70e485b7dc040d4b9fec6709254ce96.pdf?index=trueIn PDF document text
    • http://wutejaxevewef.myartsonline.com/faverob.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/a_dolls_house_bloomsbury.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_cbba38689efd4a1ab96972eee0301ff1.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_37a82ea9b13843a2b845dc4153b95f70.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/39371968347.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_6e9bf008df9348af9b0c9d74560d32ee.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_34fac945f4c14b47a5a0024ef97c24ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/why_will_my_washer_not_fill_up_with_water.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_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 5320 bytes
SHA-256: cb52d9ec55877a40c5f526616211bfc1b1f7852fd8ab8063d95594c94b3e549c
font_01_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 11040 bytes
SHA-256: 6eb69d64b6991793e488159de7f05c95c313c486deb7b3e51d6f2aae9208cb07

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