Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7a96a25ddfd748…

MALICIOUS

PDF

73.2 KB Created: 2021-02-24 04:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 304b370c98385bd04507eab530ff50ea SHA-1: ca387b083b6dfae39ca6cdfdca4f12ed1332656b SHA-256: ea7a96a25ddfd7482d92840657f930f230b92ee28a425c9dc05421db5002ef6f
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. The document body, though heavily obfuscated, suggests a lure related to 'Arduino programming handbook', likely to trick users into visiting the linked sites. The presence of many links to disposable hosting and the 'link farm' heuristic indicate a phishing or redirection scheme.

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://leonvi.ru/strik?utm_term=arduino+programming+handbook PDF link annotation
    • http://nesobaka9.xyz/fadadotikujozokuw5lus1.pdfIn PDF document text
    • http://tubunasozejut.22web.org/gejagusorasunan.pdfIn PDF document text
    • http://forexgeeks.net/bulawayo_mapjnen1.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/4mXCHie/frases_tumblr_de_amor_para_fotos.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxopejitin/jieicii/langrisser_i_ii_switch_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/BnydSjj/communist_symbol_red_fist.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/eNhhZL7/16250220517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fce276bb7f99.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/hgfvidl/the_homeless_gospel_choir_young_and_in_love.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/hs5NJja/volufafapamufesegato.pdfIn PDF document text
    • http://soluzixod.66ghz.com/video_ucapan_anniversary_1_month.pdfIn PDF document text
    • http://henrysavbr.site/nosler_reloading_guide_7_free_downloadloxfm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5fcbdcf43b10a.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/jcIifhf/bijajagaxeveguzepesoso.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/ihHegeO/best_tiles_for_kitchen_floor_ireland.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobofitis.epizy.com/does_living_and_non-living_things_depend_on_each_other.pdfIn PDF document text
    • http://wabifitas.epizy.com/sodastream_source_element_big_w.pdfIn PDF document text
    • http://mesitineka.rf.gd/kuttymovies_da_2019.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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 5356 bytes
SHA-256: a3d161afe56d240dd09603c536b90e820ab15725836d5d8f447f23561233e674
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10128 bytes
SHA-256: cc49a45139fb6d8c37739dfc4bcd9535ddc9ff28fe9f27347435871fac5bcb47

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