Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a339553aafd33db…

MALICIOUS

PDF

117.3 KB Created: 2021-03-15 06:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dae1ec0119e9fcb9098190592ca0ecc SHA-1: e617b8f665df93e14bc1921686b0ca925d649376 SHA-256: 9a339553aafd33dbef21780bbad7780610f5f19a64f4858c638a9524087d5913
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a significant heuristic firing for a PDF link farm, suggesting an attempt to drive traffic to malicious sites. The document body, though heavily obfuscated, contains keywords related to power amplifiers and references wkhtmltopdf, indicating it's likely a lure to a website disguised as a PDF. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or SEO-based malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=amplificateur+de+puissance+classe+d+pdf
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/a1bfb7c699e44f.pdf
    • http://tendernes.ru/ios_free_vocabulary_builder_appml6ka.pdf
    • http://gazajujana.mygamesonline.org/ccna_cyber_ops_secfnd_210_250.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/sikolelevez-ladesamolumig.pdf
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/lurowadumezulav-pujupadab-lafetusos.pdf
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/wifozuvuj.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/kagev.pdf
    • http://kakorezikudu.mypressonline.com/pharmacy_technician_resume.pdf
    • http://scandisvet.ru/what_can_form_hydrogen_bonds_with_waterirklk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b638afe-ec24-450a-b39d-f1074a688af9/vovuviwuwilekavul.pdf
    • https://uploads.strikinglycdn.com/files/0943e8fa-f232-478c-b728-0bfafa312302/67094453908.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_7ec4190ff23c416fb8a400f2b3938a9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0c5c23a-39bb-4ab5-9ce4-2b70f606a258/security_analysis_and_portfolio_management_anna_university_notes.pdf
    • https://uploads.strikinglycdn.com/files/9ca838dd-f934-43b0-a03c-8e72e896ffcd/what_is_interior_designing_course.pdf
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_5a03856f33754adab241f0a82dae46b6.pdf?index=true
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_b2c5feb9fff1451ab319dd42ec91b1db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c4299f9-564b-4fe8-ab7d-a14fe22c6251/nibekijimidok.pdf
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_a3aa25e313d741fe92bb74005592caf7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd24113f-43cd-4a70-a1a7-15cedfdcb006/fosuxatazolozobeted.pdf
    • https://uploads.strikinglycdn.com/files/713502f9-abcc-4440-a6b9-1164e0c9876d/vebejojirowugafo.pdf
    • https://uploads.strikinglycdn.com/files/46bb80f5-9059-45e8-821c-a6ca1fda0633/seiko_solar_chronograph_v175-0cg0.pdf
    • https://uploads.strikinglycdn.com/files/62168bc0-208d-4845-8096-9d3eab399efe/how_to_increase_calories_on_keto_diet.pdf
    • https://uploads.strikinglycdn.com/files/5494fb46-04dc-4d6d-b012-e0ab1213d76d/what_is_your_zodiac_sign_if_your_birthday_is_in_september.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
    • 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_off00016fa1.bin
e144ed59fa8daae0ace92a0d1665cbcc1e1f64d11d034c0bfb6b1d56e1923407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA1 5288 bytes
font_01_sfnt_off0001818c.bin
0f90d54e91f9f2f5c5b59d9ed7d70468159f5fbcc29706966176558b7e31d2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1818C 14596 bytes
font_02_sfnt_off0001b04c.bin
0f12ecc9f667a553058381b4ea040c6a376b9840bc9695ddc8fda69bfba97f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B04C 16104 bytes

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