Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16a1e9795ce54db…

MALICIOUS

PDF

85.5 KB Created: 2021-03-30 18:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 84f0b364c7f999b07950d7302182fcd5 SHA-1: f99f4ad3bda0386169614b0f8fcb577658c92c15 SHA-256: c16a1e9795ce54dbdf578407ab35c81737e47ab6004f12af3fff64b3263466fa
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'nipisod.ru', suggests it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely delivered via email attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/award?keyword=agile+it+organization+design+pdf PDF link annotation
    • http://yozi.store/acer_aspire_one_notebook_battery_pricere1ba.pdfIn PDF document text
    • http://alsamcctv.com/laruvisojedixolxt48.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://lirepenepubejix.iblogger.org/65690450509.pdfIn PDF document text
    • http://ramosek.iblogger.org/bullous_pemphigoid_treatment_guidelines.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/alergia_a_aines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2de9612-08ac-467b-8b52-096c284fdd4f/mogapetuw.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/is_brother_hl_1112_wireless.pdfIn PDF document text
    • http://bibebebimil.epizy.com/gregor_the_overlander_movie_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/lavefoselivolilof.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/83218487584.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_e4a2723470484ed28b3deb2b724c9c8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/840c1f0b-a661-474b-be0a-138954ed7cc6/how_to_reset_lg_phone_metro_pcs.pdfIn PDF document text
    • https://c7c6162e-a986-45e7-9b02-228acb36ab76.filesusr.com/ugd/6c313a_b165f87dab6c45e3b3e496378a9d843f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63881c5d-4f66-4585-b5cb-da9c55d4e16a/genie_blue_max_3900.pdfIn PDF document text
    • http://jikelofov.rf.gd/joint_venture_agreement_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91002ce-3eec-4847-8ef4-9d7c44c286cb/48894744302.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 13268 bytes
SHA-256: 2752993a775614d221a661c058dad987b47b14656ed8364272baa1779dd85c49
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 5248 bytes
SHA-256: 366f42c518eaa8cf9a3367ebc1142d452ce7d15c9951c741e8886dc69e52faeb
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 10732 bytes
SHA-256: 1dd4bb35b9178706f3161870b2c967ea8090e324e918f310f860cf6d49517b7a

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