Malicious PDF — malware analysis report

Static analysis result for SHA-256 4133691404d215d9…

MALICIOUS

PDF

78.1 KB Created: 2021-02-21 19:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 192651b77cb338d74893244bdb4a0815 SHA-1: 88846e4323e0925c67a4c6325e3175d0700a66c4 SHA-256: 4133691404d215d90f076a68e04ac95cfea3e8ae0ad4f3ef357d5d4173e5dbec
134 Risk Score

Malware Insights

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

This 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 hosting, suggesting a link farm or phishing operation. The presence of a 'download' call-to-action phrase further supports this, as it aims to trick users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=true+skate+mod+apk+rexdl PDF link annotation
    • http://muzhskoizhurnal.ru/timed_fluency_passagesty2mk.pdfIn PDF document text
    • http://my-favshopf.online/59585838688q0sjk.pdfIn PDF document text
    • http://sekejibugu.iblogger.org/is_nancy_drew_going_to_be_on_netflix.pdfIn PDF document text
    • http://gegejobusi.22web.org/sujorokewamux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5fe05f7fd2c3e.pdfIn PDF document text
    • http://leaninrzpd.site/heart_of_galaxy_horizons_shipsp711g.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/video_bts_fire_bedahlagu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5feb645a45cd4.pdfIn PDF document text
    • http://gnfcns.info/baldurs_gate_3_mods_multiplayer3ekyr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_6015d46f4d4b1.pdfIn PDF document text
    • http://fitnesspack.net/miners_haven_qn_setupgo48x.pdfIn PDF document text
    • http://osthondroz.com/gijozirovabidokogemepikiiqwk3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fe86bd950951.pdfIn PDF document text
    • http://xelirap.22web.org/how_often_to_change_oil_on_a_prius.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linakagiwabofa.epizy.com/add_button_navigation_bar_xamarin_forms.pdfIn PDF document text
    • http://jewikotadukusug.rf.gd/bala_bala_magadivoy_songs_free_320kbps.pdfIn PDF document text
    • http://ripapekum.epizy.com/world_geographical_map_free.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_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 5184 bytes
SHA-256: 95dc85af483638eb5e72cf0ff80433b5c1b726b677d0f83e94616d96ad35ece9
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10592 bytes
SHA-256: a1c27af1fe406e910d5a151e19a68b2f0b72f4b2ad042195c0e8d36dbc0622e9

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