Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c71fd88c364e8f…

MALICIOUS

PDF

82.2 KB Created: 2021-06-11 03:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f0f9215d124e8ab4fefc3d935b9ec258 SHA-1: 55134f5ebc97a1e5be46c03da43307c929670354 SHA-256: 01c71fd88c364e8fcb361bb56ad6784604adc70c706fcdd0c9c98214ffa199bd
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 0.9996

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://medvor.ru/pbw?utm_term=kc+sinha+mathematics+class+12+pdf+download PDF link annotation
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/kizakuzufo_rutizegulizujo_fizunojonulan_wodisedaxul.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4423171/normal_60b1e63c7fa93.pdfIn PDF document text
    • https://jujijojof.weebly.com/uploads/1/3/4/3/134353579/6d7895d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fe42ce921f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_5fd0fee26ff13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490264/normal_5ffeef2d5fc91.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/8197829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_6033883f51138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fe701d0110b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144417771/football_manager_2014_patch_14.3.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75eed453-22bb-476a-bcf1-4689346d71b4/43591279400.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/shot_by_shot_analysis_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11eba5c2-1520-4b91-8f63-83e3c7e47265/sikatop_seal_107_tds.pdfIn PDF document text
    • http://veposasidot.pbworks.com/w/file/fetch/145084338/17776331501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746115a2-0258-4a79-9879-af2a54bfc043/what_is_traditional_music_in_japan.pdfIn PDF document text
    • http://xudusuvo.pbworks.com/w/file/fetch/144853461/xutagidegovipej.pdfIn PDF document text
    • http://resewoxe.pbworks.com/w/file/fetch/144841686/39799435220.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 5544 bytes
SHA-256: 2d51418779ac6a13d51b274dd90e02d9495783575de57ed6c8fc9096dbc32477
font_01_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 10248 bytes
SHA-256: eef65cf53ba95b127530ac393859eca72033491e53e31fb68a390938ce60e9c8
font_03_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 9652 bytes
SHA-256: 394507041508fda87377fa7aaed3880b3d576c7194280d0af088b0a95c290dc8

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