Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0e45e9fd02f029…

MALICIOUS

PDF

75.4 KB Created: 2021-01-29 11:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6c4410e3ab596c2dd51ab491ef381404 SHA-1: c6d9400c9625ad9e2d9dc296c825315790bd69dd SHA-256: bc0e45e9fd02f02967b1d08bddb19d1ced77c77a2bea29c98412bb21f6a41172
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=quasar+air+conditioning PDF link annotation
    • https://cdn.sqhk.co/zuxatotukaru/jcpXRih/prison_break_season_5_episode_9_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/yiiOahz/track_location_of_mobile_number_online_free.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/3422483.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/gLieKv5/82007059423.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/zafegapozuk.pdfIn PDF document text
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/7049673.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/dasewexoxewaz.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/e6dec3251.pdfIn PDF document text
    • https://juvejisedebuz.weebly.com/uploads/1/3/2/7/132740880/ralopawa_vumif_monilujawidene.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/3873875.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/gjhiQgi/folejameb.pdfIn PDF document text
    • http://antonio-ita.space/download_game_uphill_rush_waterpark_racing_modbz6qg.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/dhih8yS/best_live_channels_on_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ifNjaWp/scummvm_ios_xcode.pdfIn PDF document text
    • https://pevarigemi.weebly.com/uploads/1/3/5/3/135303959/wojatewozaxoxav_guvedizipuna_kaloduminapi_bajav.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/HgeChgf/nimupi.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/tinivukedeta/test_de_apgar_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/bewars_movie_songs_telugu_lo.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/netflix_app_iphone.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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 5136 bytes
SHA-256: a98380142e1c679867e319cea63f6858be70c1c30f295b80871ad2d533989365
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10356 bytes
SHA-256: 1752a0ee2bcd0cf107209d7b43bd7c5c0a1d541e5f83f71bd1989e1546e0a850

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