Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e51473f9c28b830…

MALICIOUS

PDF

71.8 KB Created: 2021-04-09 15:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fad9a5256b837d078135a5a285d03aa4 SHA-1: db8097578a1e19f374d166901c606eb548c9d117 SHA-256: 1e51473f9c28b83044916f168ac2cc929a6a80e5fec200af3e1b9cbe6e8fcceb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malware or redirect to phishing sites. The document body, though heavily obfuscated, suggests a lure related to search results, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=python+date+range+to+list PDF link annotation
    • http://optarfes.com/tukimurusatipinomasinovds12.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/vujam.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/dumojesukozapom.pdfIn PDF document text
    • http://halfraire.xyz/99033151072srccy.pdfIn PDF document text
    • http://podarokinsta.online/how_to_use_a_stove_popcorn_popper7j3i6.pdfIn PDF document text
    • http://ecoservice-vlad.ru/does_excel_have_flowchart_templatesuvk64.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/haT7idZ/revolut_business_account_bounce_back_loan.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/iehdhgI/midtown_crazy_race_chomikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/gCr2Igi/tasedulosefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_60057964aa9ee.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/DjbohcR/liwukunalegazeb.pdfIn PDF document text
    • http://xozonline.ru/721891403476uj54.pdfIn PDF document text
    • http://inmyshtangen.xyz/how_many_layers_tcp_ip_protocol_hasu5tyv.pdfIn PDF document text
    • http://copyrighthelpcentral.com/wealth_x_billionaire_census_2020hjyn6.pdfIn PDF document text
    • http://jirafka.space/738920451887y0g1.pdfIn PDF document text
    • http://usecabinets.xyz/xonamevawuzafumiju2n2h.pdfIn PDF document text
    • http://price-list.moscow/loregivokawedulxij.pdfIn PDF document text
    • https://cdn.sqhk.co/jafakitiw/jriiKhb/strategy_definition_oxford_english_dictionary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_6067a8f841578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_6036d99895194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filosoko.onlinewebshop.net/dazejejasebibabates.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_472e4e95ee2c4c75987d32cd8d4e3a17.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_93b2986490f84ca7ae0722833d78e8b9.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_d2c18979d4f74829b70b5cc8b343c829.pdf?index=trueIn PDF document text
    • http://posikin.myartsonline.com/wigisixurujopirowe.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_acf2071abd6a401cb8b62bede612bf8b.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 5192 bytes
SHA-256: 3ede1a5336520b661e145fc56e70759751daa9ce3fd21e7201b02c523112dc24
font_01_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10840 bytes
SHA-256: d4d43de6700a10a3e102ec4176170610d8e3bc29eddec17c65a0b37edd84419f