Malicious PDF — malware analysis report

Static analysis result for SHA-256 6471857f3730d391…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 11:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 597ae9334604755926ff147ca395a481 SHA-1: 1ad3b850f94c4cc67015275cd26c84cc146b4c66 SHA-256: 6471857f3730d391ba621370952a0f4d7159f8191b32992ddb9bbc2aef15697b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm, indicating a likely attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and potentially a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=age+of+empires+3+mobile+apk
    • http://bitjoms.xyz/how_to_clean_a_comet_torque_converterpkw5m.pdf
    • http://fupemagis.mywebcommunity.org/importance_of_english_in_multilingual_society.pdf
    • http://honey-love.ru/95349206556nk1tn.pdf
    • http://difulomutanuv.iblogger.org/ganawoz.pdf
    • http://stat-index-co.com/what_does_service_stabilitrak_mean_on_a_cadillact3o0l.pdf
    • http://zawopim.mygamesonline.org/52068685920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cc30ea07-7637-40ed-bc2b-94d5a05b884b/62539072459.pdf
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_b55cc160af0a4c2d85b20d4a7fb49726.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b15cb62f-25cf-40b9-ab38-8db390c626d2/are_ceramic_heaters_safe_for_tents.pdf
    • https://uploads.strikinglycdn.com/files/b5a839c5-8814-4683-b773-d9673d5f29db/biology_chapter_13_assessment_answers.pdf
    • https://uploads.strikinglycdn.com/files/8b4a018e-6d11-4dd7-8978-c5de5dd97cd1/mofexata.pdf
    • https://uploads.strikinglycdn.com/files/1ea8504d-2d91-4c7d-a4a0-50ea4571f583/descargar_el_secreto_ley_de_atraccin_documental_libro_completo_espaol.pdf
    • http://kuwokezolofe.epizy.com/gupipazalopidixowarupi.pdf
    • https://uploads.strikinglycdn.com/files/947a1122-3907-40f4-a4a6-8a22e1a25f35/40803684010.pdf
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_0747db5b27cb46ffa01235a9eb3b7e62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e59cd04-a246-4981-8c84-907612a4c84c/goresorosegilumar.pdf
    • http://jefebewo.epizy.com/format_of_acknowledgement_receipt_of_documents.pdf
    • https://uploads.strikinglycdn.com/files/a42194e3-e5d3-4b1b-8996-33b8b787ad13/a_clash_of_kings_illustrated_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/989d6546-1416-4c65-ae45-53eea54d60ce/31106651058.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_off0000e647.bin
06f6d7e12ccc1ec5970b1c6d6d1bbc48eb663a40a638d11b410d371b00b322da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5180 bytes
font_01_sfnt_off0000f7e2.bin
c400a0a2780bff9873c95f01ce8b06d3a685b2e6f923b5734b71a27117ac91f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 13744 bytes
font_02_sfnt_off000121fb.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 4324 bytes

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