Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff4c7050e4c0b8d…

MALICIOUS

PDF

76.4 KB Created: 2021-03-08 22:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2b4b809b847f8b320437de6aa952867c SHA-1: c3a30db5ebbb515ad318fd8cd61d3e9a3681f0cc SHA-256: bff4c7050e4c0b8d81542b643d553bf603cd2a2325708da8693aa520ffdace6e
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to `golowaki.ru`, suggesting it's part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true malicious destination.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/123?utm_term=ironic+doge+template PDF link annotation
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/204213.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/zobipetazif_sabekimaxozute_ximiruvazelaz.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/17672616987.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/romeo_and_juliet_2013_full_movie_subtitle_indonesiah85ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386334/normal_5fe0dddd57dc0.pdfIn PDF document text
    • http://rezonansmusic.com/ashokan_farewell_musicxisfv.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/what_are_the_features_of_a_games_console.pdfIn PDF document text
    • http://korezafegedim.22web.org/sbitly_earn_money_app.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/804524.pdfIn PDF document text
    • http://pipvip.ru/cobra_29_ltd_classic_power_cordpx7xn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_603f59c7ca2d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_601e53e9cdba6.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/dbea5.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/fedure/is_11171_transformer_losses.pdfIn PDF document text
    • http://wigufoxeb.rf.gd/in_the_time_of_the_butterflies_chapter_5-8_summary.pdfIn PDF document text
    • http://jiguluvosasibun.epizy.com/lavapo.pdfIn PDF document text
    • http://zibevili.onlinewebshop.net/bohemian_rhapsody_sheet_music_piano_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/22149390516.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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 5152 bytes
SHA-256: 5705e1761cd338186ae59a70fe11e23cc4ac63b32a03ceef422620deed8855c5
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 12032 bytes
SHA-256: 6a4f74100e98b54a86495cd6ed274f26d6668122583d349594e677e9a6c3a764

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