Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fa1a99e2aaca7d…

MALICIOUS

PDF

100.4 KB Created: 2021-01-31 09:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f46f4d0a2cf697fa37a0b501668b864e SHA-1: 8322bb0c65a8404a1dc7ba6b553b18a24774b662 SHA-256: 77fa1a99e2aaca7d615a8485e2362b5249f276270f823a77c1f8ed3b8ccd7637
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://bologen.ru/aws?utm_term=occasionally+formal+synonym PDF link annotation
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/bc97eeabebf513.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/jeZfjbn/24352244208.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/edgcjh2/bipuva.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/GX1iceA/download_crash_metal_mod_apk_terbaru.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/4ijWJGp/godukefugemibanekutudu.pdfIn PDF document text
    • http://anarchymedya.com/13745614953oghno.pdfIn PDF document text
    • https://dufeduvu.weebly.com/uploads/1/3/4/4/134481569/e713e858a.pdfIn PDF document text
    • http://help-business-media.com/probability_shiryaev_downloadl22rm.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/gbZQ7hj/ludo_battle_kingdom_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/datisafapuv/iihfijj/video_player_app_for_mac.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/8834185.pdfIn PDF document text
    • http://lifeshop.pro/gudelagexulegikupapimakfa8n.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/xexuvow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_5fc72b1811014.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/KhiPG8E/real_wedding_makeover_salon_games_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00015443.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15443 19856 bytes
SHA-256: c1f534fa9cf7b68a7df2ac545920f0c7bc5487a2a25af870c19c72482e18957c
font_00_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 5608 bytes
SHA-256: e3487964c7ec4a631da9afa1a6e2bb507493bb4d1f56c25cf92e9b1d3a577e2c
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 5156 bytes
SHA-256: e0151059ab1d50f202b1f16e8abab8b2f62f8287ae19fbd56565b5e7e99a18cc
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_03_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed
font_04_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 2108 bytes
SHA-256: b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b
font_05_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 6072 bytes
SHA-256: cd75f234ec5d43f09a14b2853061fb8ed8421d745820637677dd1366ff53b6c8
font_06_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 18304 bytes
SHA-256: 445efef746048fe87b5b1f3c25d01cc8b0cdb905ed20cd5a5219b97d9dae238f
font_08_sfnt_off00017663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17663 2832 bytes
SHA-256: ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319

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