Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9c6381dc7266b5…

MALICIOUS

PDF

74.6 KB Created: 2021-03-24 18:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6ad99f94efcec23896bb6309bce4ed9 SHA-1: 1bda945ee7676e59cf4010a07cab5b5816f76f4c SHA-256: fc9c6381dc7266b55c676e54aebf736b5a1cfe6ce35e6fea797f7936e7fd970a
186 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of multiple external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=correcting+run+on+sentences+worksheet+high+school
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/vajotubanejidulibux.pdf
    • https://xobagosuwetir.weebly.com/uploads/1/3/2/6/132680986/kuwowodebus.pdf
    • https://cdn-cms.f-static.net/uploads/4381085/normal_6018eca372083.pdf
    • http://7lessons.website/jemukopiw6ta.pdf
    • http://kigadotezolesun.mypressonline.com/xijeluloxefemojibumanixul.pdf
    • https://cdn-cms.f-static.net/uploads/4417523/normal_603e4667b9103.pdf
    • https://cdn-cms.f-static.net/uploads/4422877/normal_60244c16726b7.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/vigut.pdf
    • http://macsk.space/girudoro2q4d8.pdf
    • http://form-lnstagramverificationbadge.com/xepexudopijomulisekanozyzjtf.pdf
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/4583583.pdf
    • http://zotikarida.medianewsonline.com/93807273456.pdf
    • http://detonic-ro.website/phrasal_verb_define_cambridgewk3el.pdf
    • https://cdn-cms.f-static.net/uploads/4421210/normal_60462399e652e.pdf
    • https://zubowofele.weebly.com/uploads/1/3/4/3/134381568/4619752.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_21af1f0c9c7e4d89a4253feec85b28f5.pdf?index=true
    • https://s3.amazonaws.com/pusori/delta_electronics_annual_report_2015.pdf
    • http://nubibubimalepik.atwebpages.com/odisha_govt_holiday_list_2020.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_a3d0bbdeb53e450b937d9ec58e3ea99f.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_5a4fdc269c264bec92ed6a994fc84e3f.pdf?index=true
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_51d7884d76b44150a4178b3f8a7973c3.pdf?index=true
    • https://s3.amazonaws.com/xafaxotaful/casio_g-shock_g-9000-1vdr.pdf
    • https://s3.amazonaws.com/wumodukubaru/sailor_moon_heart_moving_sheet_music.pdf
    • https://s3.amazonaws.com/fusidejebi/jovibaxizitudufigite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6db.bin
8bd346eaf1b230edbafaf2a1d95e8a07daada5352a6cdd8c2232d7cbc0b0e52b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 4912 bytes
font_01_sfnt_off0000f7a6.bin
0989563e3f09f7aeb665a85f89ac798577ff449e55c1273f6b487cd3f05b4894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 10904 bytes

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