Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c61882d955267…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 06:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df252391a6b79edc12d97d377a44a382 SHA-1: bfc5eef9b440624faab47b5db93bc2c8caf3d20c SHA-256: 6c9c61882d9552672cf18208b026d59776540978c0ede990151261d60b84eadb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://fokemale.ru/123?utm_term=accp+chest+guidelines+vte', identified as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure malicious links within a large number of disposable domains. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests it may leverage PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=accp+chest+guidelines+vte PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ffe89354d36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_60491578af007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_604ee9ab20f58.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/advanced_trainer_second_edition_free_download.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/railway_ticket_reservation_form_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6037ebb67f8c5.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/biology_class_9_book_english_medium.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/51953631313.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/economic_lessons_from_asian_tigers_japan_europe_and_america.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipemoluligera.myartsonline.com/botulismo_em_ces.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/java_jdk_8_64_bit.pdfIn PDF document text
    • http://pekamidakoj.atwebpages.com/56831695979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc4fc43-0a48-4f77-9783-2f92552fc827/sotepijirutarazila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3c7d90-93ad-48a0-9372-32a8c9711842/sijiwukoxofa.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/non_reporting_member_of_participating_ffi_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae9cc50-e976-4170-aba3-788f7d2d4a3a/what_is_a_data_miner_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0be3ff3-e345-4fad-bc83-574bee080e78/how_to_pray_for_a_good_husband_for_my_daughter.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/baby_animals_flashcards.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_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 5080 bytes
SHA-256: cd47f90a91a06406940a5689c8119e3204f16bb482b84c15c3c612f4a604d841
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 11104 bytes
SHA-256: 2f5393d3a5957d2d4b556e6e9716b01593aeb2f13c09a642df5e9f14e3e33517