Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b74c4c77118e856…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 09:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5f53e61b89bfb50c92010994bd8ff114 SHA-1: 1bd7aa35ecc1321917c70d198d25a32f8cbe6324 SHA-256: 6b74c4c77118e8564e67c2d98a89882600789673f968e612da7da7793369f5f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search results or distribute malicious content. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vilenefex.ru/award?keyword=cambridge+english+unlimited+placement+test+pdf PDF link annotation
    • http://jakor.pro/how_many_pages_are_in_insurgentv5k7i.pdfIn PDF document text
    • http://alcozerox.com/35121773345gmb3m.pdfIn PDF document text
    • http://freedate18.xyz/pokemon_sun_and_moon_citra_android9soo3.pdfIn PDF document text
    • http://naturaitalia.space/does_amazon_prime_have_indian_moviesxfyp4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/what_is_absorption_spectrophotometry.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/tfeu_competition_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6eab4fe-22c2-42c1-86a3-659cc3d23a87/enthalpy_change_definition_chemguide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107c8820-7692-4375-b04b-911d202ddbec/pavavinedonod.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/28956533469.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/6015342379.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/51822676388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac40ebd9-d0c6-44b2-8e2e-5ee6d08b6de3/what_is_the_appropriate_alignment_of_a_mla_style_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/cancer_de_mama_minsal.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/can_i_buy_stock_today_and_sell_tomorrow_on_robinhood.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/sudupalamevevez.pdfIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_e36cb90fa9f8435a934910567a10928b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa797658-8818-46c7-9074-e515d1626467/45769456192.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/mabopoduzijidelomorif.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/antiphospholipid_syndrome_guidelines_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/bidaai_wedding_song.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_d2917868a0ee448d8ccdd81ae9b9d8db.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 5612 bytes
SHA-256: e9ccb675855ff0805b6a6b6b5ff86b74c6606e4b80d8d435fa64e0d60e1c6f60
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10656 bytes
SHA-256: 5ef48cfe24fb4816f766e1fb8a6fe3f16d15eabc71b41067e79918a00f8a3492

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