Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac54eacfc22853c6…

MALICIOUS

PDF

92.4 KB Created: 2021-04-15 07:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d217ea7085906be8e69168e84190e8f SHA-1: d7bdc1ad57c35979d691e47c775dd07e7c9e6b5e SHA-256: ac54eacfc22853c6e76be2b0140209a53727ea973bf09461561ad92cdfb55ba3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=how+to+read+standard+normal+table PDF link annotation
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/vamidapugur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_601cbfcb470e1.pdfIn PDF document text
    • http://ionatr.fun/roomba_880_error_codesjvi8j.pdfIn PDF document text
    • http://car-den.ru/948052396sn812.pdfIn PDF document text
    • http://helper-badges.com/does_a_gas_hot_water_heater_have_a_reset_buttonmxvyu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_602959be3124e.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/pabatolofone.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/f4437d99e.pdfIn PDF document text
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/vebegafinon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_602c51637047c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fd7ccc76abb9.pdfIn PDF document text
    • https://mafidusat.weebly.com/uploads/1/3/4/1/134109097/limajufateg.pdfIn PDF document text
    • http://fullstacket.online/316809982301ua16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_604fa8101b22f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_c9cce300b48643ceb50c42f590f553c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/on_the_road_again_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecfd4e6-897e-4185-a62c-4765a798c4ae/2633419765.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/good_answers_to_how_was_your_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837f82d2-69dc-4602-9408-9e6cd608158d/alexander_the_great_empire_map_modern_countries.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_f8ab14aae405445ab09508bd0b3f1380.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1564e33-bf6a-44c7-9df0-fb982d485b24/tuning_an_ameritron_al-811_amplifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e11cd33-2c59-4cd3-a6cd-468964ae075d/nikavi.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/nenovetisel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1e40f2-d7ee-4ea8-962e-b44a30b06eda/53792029383.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_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 5164 bytes
SHA-256: 19a18244d5627939c5cc2ddf894df0eff221d5c94d33012713cabb0f5094dfa6
font_01_sfnt_off00013b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 11972 bytes
SHA-256: 7f737704a4266cd411195e979ce62883082217b3340b3768f7e625aff5c5a896

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