Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab6e3df56c6b6bb…

MALICIOUS

PDF

82.6 KB Created: 2021-03-16 05:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95726b11b49d1207152d29f925904e1b SHA-1: e320f8199c736610da4504ded02335a8bc8dc2ac SHA-256: 0ab6e3df56c6b6bbc50f2b1bbc9696028049c6933afd71f9b7a847ef00575a80
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('pelibifir.ru') that is likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=categories+of+exceptionalities+pdf
    • http://beremoter.online/pictographs_worksheets_5th_grade6clf4.pdf
    • http://chelamela.org/jeliwotasikaroxusugutenues65x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jifesu/mubexugimumomoxuruk.pdf
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_87cdec0333c84cedb5114483de219b65.pdf?index=true
    • https://s3.amazonaws.com/taturi/clasificaciones_de_cuentas_contabilidad.pdf
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_90e2fc77889340d5bd79d0a89aed45c3.pdf?index=true
    • http://muduwabu.rf.gd/fivotiz.pdf
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_69aabec315f84eba9a652506d1cfd507.pdf?index=true
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_2957a04e042642edbb1c62c021a0ccc4.pdf?index=true
    • https://s3.amazonaws.com/pukiza/5529733556.pdf
    • http://monuwuwotivonil.epizy.com/71639112008.pdf
    • https://uploads.strikinglycdn.com/files/17838308-0b19-4964-8d83-a6ca82c08bcd/53561271384.pdf
    • https://s3.amazonaws.com/xupizewuxere/what_is_literature_definition_summary.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_23c2e110abc0444f9943801a4e673132.pdf?index=true
    • http://kapudezab.rf.gd/how_to_crop_video_in_premiere_elements_15.pdf
    • https://uploads.strikinglycdn.com/files/22f567fb-3e21-4f37-a026-0e0dd8aa0ded/cisco_switch_commands_vlan_ip_address.pdf
    • https://uploads.strikinglycdn.com/files/c31419f5-c2fd-4325-9d58-99068ac945db/82607480436.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_ac43a75b19174166bdb9f969ce96ffb7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b010417-5637-4f2d-b51a-5468d434d94e/75423244987.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_f778fea9a19b48788274f9678bef8c96.pdf?index=true
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_a6a3319afbe04359a44e63fb16b9a740.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f803.bin
2e67da36b743727d7ee8a2cdb4dc7f3a5c4950dfa8bded65db21bbee41cd2cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5204 bytes
font_01_sfnt_off000109d0.bin
471be0b0803dfd17cab1aa141c5e884e6b1a552fdf69cce8bbb5bb8878a78568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 10868 bytes
font_02_sfnt_off00012ea0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 4324 bytes

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