Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d55de5a4edcc51…

MALICIOUS

PDF

76.6 KB Created: 2021-05-22 07:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e31a8451aee5b96625f8164e9f76496 SHA-1: c1cc2e4f80a1ca8b290c4bd5016f4454ab2af589 SHA-256: 97d55de5a4edcc5140339f7224e05b9eed5e6a69db23ab5ceb3595521d2b5b96
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly suggest malicious intent. The primary function appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=human+body+systems+free+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5ff305aa5b36c.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/zajipig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_603c035255eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_60540475f0b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_6032fa18b0efc.pdfIn PDF document text
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/dekusodatekupowa.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/33e0d27ea1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_605258c391c81.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/48db0349f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_605b9005a3ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6054c2f08cd29.pdfIn PDF document text
    • https://gamiwejejorar.weebly.com/uploads/1/3/4/4/134498461/6140719.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/3e695c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_602ec784a1036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6065d41612cc3.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/6c770760-5315-4087-9a31-28af5cccafa3/panejebekatimafofikida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d535f2a-915a-482b-9f78-0b439fdb32ce/samubanobapilanulevijaduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe5a09d-3ec1-4958-9b0c-0d6571961eb4/the_game_changers_cast_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdd6263-fa5a-4652-8038-795287dd6815/warcraft_3_reign_of_chaos_patch_1.26_cz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cc2a4a-84d7-4cbc-892b-b601cc98c269/siemens_hydroranger_200_manuel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e79801-b122-4b46-96d2-10c434547aae/ielts_academic_writing_task_1_samples_rachel_mitchell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21240af0-9b82-48b0-b57b-b73a35109405/whirlpool_front_load_washer_drain_pump_filter_location.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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5472 bytes
SHA-256: f25b3d47bd75416ddb6e8295dd363758e9a9565860da98d5d6027a5e400dc285
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10248 bytes
SHA-256: 09ca5a2c8aca9259634577281ffc1333d695d45818e7f50d475526fd6fb6c739