Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec8844bccc73f08…

MALICIOUS

PDF

67.3 KB Created: 2021-02-23 08:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 63558d80224b183c3dc6e3536a8a6f9e SHA-1: 2d4e0c4e50d3caef42b05358e65749bff2eb635a SHA-256: aec8844bccc73f085f43dc3ee2fe32f903c2ad10d041f5fd60614c18bd2ef3d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://crophysi.ru/wix?keyword=resistor+worksheet+pdf PDF link annotation
    • http://reduslim-siteofficial.site/bgp_configuration_labfbjsm.pdfIn PDF document text
    • http://straponartist.com/alethea_group_disinformationmuxde.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/download_dancing_line_2_modhhnp5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/ifjd8li/ririravawaxusonasobonego.pdfIn PDF document text
    • http://anrostore.ru/have_yourself_a_merry_little_christmas_lyrics_original_judy_garland3gu01.pdfIn PDF document text
    • http://znakomstva18x.site/vofiduo2j0.pdfIn PDF document text
    • http://1xbet-registr.site/181562466161g9u3.pdfIn PDF document text
    • http://ozalupa.space/tamilrockers_tamil_movies_2017_hdqea0e.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/PThe8X8/bingo_cards_numbers_1_75.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/W6jcKhf/facebook_lite_facebook_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/hfGha0o/mcat_testing_centers.pdfIn PDF document text
    • http://opticsystem.website/fuzelefajelafulerunok2de7i.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/ahic2gi/rip_scary_math_teacher_field_trip_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/hihwgjK/baseball_trading_card_value_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/mfUOBia/magiwafudidabafu.pdfIn PDF document text
    • http://naturaleone.space/yelp_dataset_jsonznp60.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/bgcMmec/etisalat_business_center_dubai_al_kifaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subutolibi.rf.gd/98038897683.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/free_blank_ukulele_tab_sheet.pdfIn PDF document text
    • http://gigidokolud.rf.gd/jisuriwoxogonuza.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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 5052 bytes
SHA-256: e9aeb7e3b1809bf68ed70d598ffb8996e5a1ba505620deadf8acc378e0f348a8
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 9688 bytes
SHA-256: e65a3de81702958a87d301129c29efb1b5386dc9fbf5d6ce529d0c1810667a7a

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