Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afc6b79f9f17797…

MALICIOUS

PDF

80.0 KB Created: 2021-04-05 11:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e914e3469fd23c0a9e4bb684d33e36fd SHA-1: 9d15bd51c3d97c0e6ebbe7c49aeedc1793eb2d42 SHA-256: 9afc6b79f9f17797488a57c3d2071c9859dce30a89684f046725a302e505f444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary URL suggesting a lure for a book download. ClamAV and ML heuristics classify this as a phishing or malicious PDF. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to download further malicious content, likely PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=the+anatomy+coloring+book+kapit+pdf+download
    • http://copalofa.site/boomerang_converter_onlinejmocg.pdf
    • http://ses-paypal.com/loranufefavanem2n9gv.pdf
    • http://bbbbbbbbeeee.space/wezinusodorozodolerikutad5qt3v.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lijopavexanuse/sogixubuxanorulomutema.pdf
    • http://segudufarus.epizy.com/filehippo_smadav_antivirus_free.pdf
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_1104ba3b276d4e98a5cb303694df311b.pdf?index=true
    • https://s3.amazonaws.com/donake/reliability_design_analysis_report.pdf
    • https://uploads.strikinglycdn.com/files/601d3434-1412-4ce5-b967-edfb6821fb08/nonupujomixidi.pdf
    • http://digopepu.epizy.com/devemilevagixewopadujufam.pdf
    • https://s3.amazonaws.com/xalexojaxipud/movotebawagesifogesimusod.pdf
    • http://zobotidagulipu.epizy.com/definicion_de_bacteria.pdf
    • https://s3.amazonaws.com/teximikamukubo/warfarin_reversal_guidelines_2019.pdf
    • https://uploads.strikinglycdn.com/files/20c8b4fa-3010-4ed9-8f11-55b976716f00/12182972088.pdf
    • https://uploads.strikinglycdn.com/files/c9581885-4d0b-4d32-a5d8-02ef7964b0d4/rapudulatupu.pdf
    • https://uploads.strikinglycdn.com/files/74c1d269-465c-4be4-a4a4-942b3335a766/how_many_gold_bricks_in_lego_harry_potter_5-7.pdf
    • https://uploads.strikinglycdn.com/files/a8ac172e-eddb-4401-86cf-c8dc063e7e2b/roziguvi.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_dcb4a3ce87ca42e885b5694820b608a9.pdf?index=true
    • https://s3.amazonaws.com/wivunonovef/first_page_of_lab_report.pdf
    • http://gigoxasogoteje.epizy.com/tezusafusofepozibovesela.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_8f468425cb2b4170aa5aab9770aa1607.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd3f2126-fe25-458f-a59a-23c5c09a0104/58965065794.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3d.bin
83dfd5ea52d322087dced87feae22bbd4d83a26b68fa282fe4988e63602e6164		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5528 bytes
font_01_sfnt_off0000fdee.bin
11d9afbd3eb480afd30e7526b5d11a23b8833164790e83908a467360018132f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11076 bytes
font_02_sfnt_off000123f2.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 4324 bytes

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