Malicious PDF — malware analysis report

Static analysis result for SHA-256 661831c498b81520…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 09:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c6ed7612861cc8a645c460adb48d9860 SHA-1: 1aa7f8ce5996477be4b5b08a4ed78b229a347889 SHA-256: 661831c498b81520d22ccdf3551cac4b401c5617d5a8df76e8cc814ae11ea8f5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs suggests the PDF is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=procedimiento+para+administracion+de+medicamentos+via+oral PDF link annotation
    • http://begemotiks.fun/pogromcy_duchow_2020hdylq.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/historia_de_la_bandera_de_mexico_para_nios.pdfIn PDF document text
    • http://coins24h.com/toyota_camry_2019_for_sale_in_pakistanq2zm3.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/castrol_radicool_sf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68f1650e00.pdfIn PDF document text
    • http://evakuator-uga.ru/mokesixuremimaxofunuwaw6doo.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/17404202773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5fe2e6343ea04.pdfIn PDF document text
    • http://gta-msk.ru/bleach_brave_souls_accessory_fusion_guidef00k3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_602c8210b8094.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d75dab0-b1c0-43d0-b2ed-d60e79790082/pemodomov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c328f8ed-3926-46fa-a06e-0d93475394bc/fepoluvoletoponanawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888db587-b345-49c2-b093-846d96cc31c5/coleman_hot_tub_parts_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3240d15a-5fc0-4982-a5d6-29f701988fc9/wefatokewikoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33afc5d-439d-44d0-9275-a34fb8797e8e/41590065405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f203f67-a135-4bfa-98e6-9301000ed2fb/5422101690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaf3f34-fa59-489e-b064-b7c687f8f8f1/essay_my_favourite_book_holy_quran_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7d4a93-09ba-4377-ad9a-b13bae1dee74/boy_scout_popcorn_sales_scholarship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395b5c5e-7d9b-4e58-90d5-694688eedbe1/xideruzasisetezi.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5280 bytes
SHA-256: 5829bc1c157f361fc7869f6adae3df27a70a3064920912cd4e77be891ef1b315
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10984 bytes
SHA-256: c506e4dc9f6e12505b50c45e27ba7e300afbf94b25ad0b8d7659c5dc93b91615

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