Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e7ec5c7dd08fe6…

MALICIOUS

PDF

69.8 KB Created: 2021-04-01 20:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6d3f96311cb3b575f7fe84f6ef52bc3f SHA-1: c70b6d1c9f2e48be1d5090248aa485b2f9898561 SHA-256: 58e7ec5c7dd08fe6b1a6f2eb12e9d50de19002d531737328a7627a231086df4c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a significant portion hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the PDF is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=kindergarten+letter+tracing+pdf PDF link annotation
    • https://cdn.sqhk.co/liguzalat/a3gjUig/concrete_mix_design_excel_sheet_free.pdfIn PDF document text
    • http://xamipofu.22web.org/66871147691.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/hcogije/pirate_tales_battle_for_treasure_apk.pdfIn PDF document text
    • http://arevakar-travel.com/mojumenujabilivax2gm1.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/how_to_win_pick_3_lottery_books.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/jNhejfN/the_weather_channel_tropical_storm_beta.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/balanitis_tratamiento_nios.pdfIn PDF document text
    • http://migerov.xyz/zikob1grdr.pdfIn PDF document text
    • https://cdn.sqhk.co/roduxokixuzi/eicHfPC/76555023392.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/01gfge2/best_recharge_for_airtel_digital_tv.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/fusopoxipo/how_to_replace_a_leaky_outdoor_spigot.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_35a027ac57aa459c821b7770d5777bc9.pdf?index=trueIn PDF document text
    • http://wenibeliso.atwebpages.com/what_makes_a_winner_quotes.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/amisom_mandate.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/88235332036.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_25fac6b1b3c04bd2a4a27c6f8bf45097.pdf?index=trueIn PDF document text
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_f8e709b0394e44149fae390a7513db8b.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_eb4c15b035a94277934210a9ef463304.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/do_komodo_dragons_live_in_africa.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_3bac75476c194a79a814affd7f09faa0.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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 5116 bytes
SHA-256: 3cf015cbc18c87e33991d30f0e23100476ff80224c1c6b5bf331ffb8834bb5f7
font_01_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 11120 bytes
SHA-256: 41fbb827b80bfcdee106302e9a42f89878b29a00c0690e6f7e851d12a1ae1566

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