Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66648caa7ac6841…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 00:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77921517912d2ff5bd12910a301a278b SHA-1: 4238bc8f431c86f8bd7968f6c3ae25d5d66d52bb SHA-256: d66648caa7ac6841d558a440dafb3f66097c045383f87a56334a231619b7d196
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is dafemum.ru, which is used in conjunction with a lure for a game download. The document's structure and link farm indicate an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=asphalt+8+java+game+free In PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/wixege_lelaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5ffdf4aedc34d.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/2791331.pdfIn PDF document text
    • http://axecheat7.xyz/master_cleanse_recipe_apple_cider_vinegarpvhsg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_604d65e0885f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fee1d14e2d72.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/2480846.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/common_nouns_worksheet_for_grade_1.pdfIn PDF document text
    • http://legko.travel/marlin_model_60_pink_stock_for_sale09feo.pdfIn PDF document text
    • http://kfcrabota.ru/120585509258xihb.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://mirror-x.org/effects_of_stress_on_academic_performance70t4q.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/body_rider_elliptical_trainer_and_exercise_bike_with_seat_and_ea.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/8373153.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/01474810-ed47-4a0f-8a21-22543e9f361e/xejegizitopibuliripiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e2957c-cc88-467c-b96b-9447448dae27/jadadotepigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb98271-f7aa-4682-92e8-5d4fbf95b146/15868418818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4ce531-b301-4167-92bb-30a15c134b06/tomtom_via_1515m_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8d4555-5b8b-4246-a5ac-ac33b8df5c91/69775555338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28100b3a-b566-4248-ad42-ad6f57399c9a/nick_manoloff_guitar_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a846684-044f-42a2-941f-0c629d32502d/52328525695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b19f2d-b17e-42c4-8f6f-dfef80df8b85/python_snakes_in_florida_everglades.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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 5636 bytes
SHA-256: fbd1e16476fb2b706b6e8b4378023bdb9df5bb9be7e3b8484d77190a7b341189
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 10936 bytes
SHA-256: 4629fc9f30a756e98010a1b6229b9f7a374c31f502dbb5443e5ef8140fff0dee