Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be78b4a67a3839f…

MALICIOUS

PDF

79.9 KB Created: 2021-04-27 13:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5f948aad7a1d7c0ab2f6e4a7b4fea397 SHA-1: 5b73e317bc028e1f9d89b4dc3e12683a8bba7dea SHA-256: 8be78b4a67a3839f51fa9f535f8ef62f248b939cfde41b70049c1aa9547736c9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=inorganic+chemistry+topics+pdf PDF link annotation
    • http://joxezorov.mywebcommunity.org/79293148607.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/30437.pdfIn PDF document text
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/lurogo-dogadogum-zapajepunulibir-jipafepegovofop.pdfIn PDF document text
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/raruziwinejo.pdfIn PDF document text
    • http://zuxenegobepejij.22web.org/how_to_understand_trading_stocks_online.pdfIn PDF document text
    • http://pozugazibejiku.iblogger.org/bamusalufetosonete.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/jaladu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_bdcf001ff5ea4aedb78e617a0b874e46.pdf?index=trueIn PDF document text
    • http://deberap.epizy.com/pdf_ccna_routing_and_switching_200_125_official_cert_guide_library.pdfIn PDF document text
    • http://kinuvafarugabob.rf.gd/akreditasi_puskesmas_bab_4.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_b9ff65376a224fe8b37ff0e411316938.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_aa7ad658f55e44f49e1cce4305df2dc7.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_21b9377754514cf184b6b57f51c50dac.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_8de38955efb94a7b9376b950ef2f7234.pdf?index=trueIn PDF document text
    • http://sewoxoxitif.rf.gd/6983107126.pdfIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_9e80901fb3f14907b620b0898e3bd207.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_56872b3ae8a54bb2956d804e13b20ad8.pdf?index=trueIn PDF document text
    • http://nexaware.epizy.com/zijobunalusawutisufi.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_2649b3601e854d13a19aacade7a31879.pdf?index=trueIn PDF document text
    • http://totajenu.epizy.com/civ_5_culture_victory_guide_vanilla.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/dabufivususoludaje.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 5576 bytes
SHA-256: 9bc143b6145eea2898b8066b21584d510df633d3e4e2cefb699c346149c8722d
font_01_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 10908 bytes
SHA-256: 74dbb1a2c270d06ae76cb42f88be8961cca6dbda726004243e0711f2d42c3992

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