Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f3ede1a34276df…

MALICIOUS

PDF

76.4 KB Created: 2021-05-08 13:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 437cc9f8332a0270b96e69d9e477b1a8 SHA-1: 61bcb1e595a1572573919c2a4755b1955806e0e8 SHA-256: 19f3ede1a34276df75995f325e6984d6fb8962183809979f56a22e4e2fc41457
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirectors, indicating a link farm designed for SEO manipulation or phishing. One critical heuristic identified a link to a known malicious redirector at 'https://dafemum.ru/strik'. The document body, though heavily obfuscated, contains text related to finding Adobe serial numbers, suggesting a lure to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=how+do+i+find+my+adobe+elements+serial+number In PDF document text
    • https://cdn.sqhk.co/tunuviju/hg8prXF/6329162564.pdfIn PDF document text
    • http://lazinuno.scienceontheweb.net/brzezinski_the_grand_chessboard.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/23633792539.pdfIn PDF document text
    • http://1xbet-regi.site/talemakipezafosijibozo3nq0x.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/9qb8idL/current_space_missions_to_mars.pdfIn PDF document text
    • http://salonvarna.com/christmas_carol_movie_jim_carrey_casthqki8.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/I8gijh3/joboleterumuxuvubudumo.pdfIn PDF document text
    • http://titanovyi-filtr.ru/94462158095oad1q.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jBgeBgf/september_2020_calendar_template_free.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/dc3bef86-2277-4593-8702-1c7bec524e29/62590915800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fa64e4-5882-4fcd-a7d6-64bf9b4f378e/how_to_set_the_time_on_a_pioneer_premier_car_stereo.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_19abc520815042258022c70e800c5c78.pdf?index=trueIn PDF document text
    • http://gefilodeza.myartsonline.com/anthropology_optional_study_material.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_b0addfb2e13c40e88ae4bbacde364885.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0b265d-d9fb-4c64-8dde-e187cf32058c/best_vegan_side_dishes_for_thanksgiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4101b6d7-19a3-44a0-b1db-d91bb82354db/how_to_find_price_demand_function.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/68449378760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e3907c-3446-4d18-bf73-080f5224009c/67858404932.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_2093c9e59d464fce8e637115ee954a81.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_5fff9a2035e942ec815b85811804e354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3b150a-6ad0-4f52-97ed-cff995ff5b11/vikusudubate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3152181-4ca3-4c17-898d-deace110e7e2/44199169702.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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 5348 bytes
SHA-256: cf7a091cde75a3a7e80f125d15cff7a903e2da44d13f5e75a4659ea04a76dd3c
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10424 bytes
SHA-256: d6a308d3f8cc9740e3da057019061bdab8db7956138307f03e715ee2d2483245

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