Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb59a5aed14aa80c…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 10:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f7e7efe3daa10fd1b0bbfefb1c165ea2 SHA-1: 07b6d07fce03806309dea7788bd17bd624d0ca47 SHA-256: bb59a5aed14aa80cb9b2da1e5cfa2d74a9cdee3c91a31751a57b5ffc4b33c305
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 probability of malicious intent. It contains an embedded URI pointing to 'golowaki.ru', which is likely a phishing or malware distribution site. The PDF's structure and embedded content suggest it is designed to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=digitech+gsp+2101+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5ff927e3659e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_6065fe16c1078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fe664483a601.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/cambridge_checkpoint_science_workbook_1_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_605d8ff94e3dd.pdfIn PDF document text
    • https://divisekul.weebly.com/uploads/1/3/5/3/135347680/88b351b71fde.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/28bfbb.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/can_you_be_a_nutritionist_without_a_degree.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_603bae5b9197a.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/b93b63c0-c5be-4ff1-8cc9-4b97eda57760/what_is_distributed_file_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/tips_for_buzz_cut.pdfIn PDF document text
    • http://neloralo.myartsonline.com/jain_bhajan_lyrics.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_af24e16f5ecd4c0aa39b306fb51926f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/sample_travel_itinerary_template_for_boss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a267c6-3524-442d-94d6-8934fefa9e33/fukekoniviga.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_f79a4b5ec04d4b968f21fbf47a92bce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2bd3007-653d-4c85-98e6-38c8f6b68d5f/can_you_drive_at_14_in_arkansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b38b82-5bff-426b-a9bd-f0729ae23b6b/how_to_find_the_volume_of_a_graduated_cylinder.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/26732591731.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_b3beffea17cf4767a761ccda544dcb43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/samsung_c460fw_printer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/wolaxaniwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f8ab99-049e-42b8-9b77-e0243a7dc561/nipasurika.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_896b26b267f549339585977a133d3d08.pdf?index=trueIn 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_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 5604 bytes
SHA-256: 920cf5429b3bfea1259d767de3e9fdf09096f9647a6a788c397263ec9976ebd6
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 11136 bytes
SHA-256: 547592c02eefbcaea37ee2b4facba26f4cff45808acb5692b7bdb6e451eff9e8