Malicious PDF — malware analysis report

Static analysis result for SHA-256 b641e74ba135ead1…

MALICIOUS

PDF

85.2 KB Created: 2021-03-13 14:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3edf353c51034fa4df222b9f29791f4 SHA-1: 740376a17475dcf3961913ab13cd2d89eac5a7b4 SHA-256: b641e74ba135ead14bec8ef41b7b79c8122d9ecd370117befbff5f45ae65cd91
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link pointing to 'bologen.ru', suggesting a phishing lure or a distribution point for further malicious content. The document body, though heavily obfuscated, appears to be a 'mass to mass worksheet answers' lure, aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=mass+to+mass+worksheet+answers
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/3526967.pdf
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/bikag.pdf
    • http://itfamily.pro/32265640313ly2u.pdf
    • https://gokokunebede.weebly.com/uploads/1/3/0/8/130874183/bamafezoxipaz.pdf
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/5883161.pdf
    • http://begemot.space/bose_quietcomfort_25_apple_oder_androidyv3mi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_e4e35d7b0b3b4e6caa33e135fcd07a5e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/896b360d-70dd-466d-9071-29005d0c21aa/logitech_g900_software_mac.pdf
    • https://s3.amazonaws.com/woneketelak/gcse_english_literature_past_papers_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/aa812f50-5166-4de5-84f1-db5f76c879c7/how_to_use_a_stanley_jump_it.pdf
    • https://s3.amazonaws.com/jobavo/65312295652.pdf
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_59d70c2c45d44be2ac28495eb333d83a.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_94ff4b00052e4a17b896039923f7de87.pdf?index=true
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_9e13109f471e4557acbc4bf79b8e87f1.pdf?index=true
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_6756908e64604dd3b1c07aff43eae2fc.pdf?index=true
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_cac83907a68e4df5a93f9f25d30250d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/06ab4f44-cca2-4e85-a889-4709a5fd9e82/50933206091.pdf
    • https://s3.amazonaws.com/jesidofefe/birth_asphyxia_management.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_6fda76bc162e42e49431086008b287f9.pdf?index=true
    • https://s3.amazonaws.com/buganabowumujef/playlist_script_font_mac.pdf
    • https://s3.amazonaws.com/nodetuxapabara/android_module_vs_java_library.pdf
    • https://uploads.strikinglycdn.com/files/097a72d7-1238-4703-bee0-b20fcbd043c2/42368512296.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_910e5f7ffbea4b14a9b6db3c5264e407.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ff.bin
21466c572169fce61941306ed119abda2704d1f336c1407b70dc328deff7c92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5052 bytes
font_01_sfnt_off00010b1e.bin
823d7bea0f0a865085d1bcb67dff92657792ff6ce2edc03236bbaff2f4b01550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 11040 bytes
font_02_sfnt_off00013135.bin
b22bd32a47b2483a857b6b4130e74cecea5b6b94ebe8e5c955c1b96464453409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 16344 bytes

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