Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d91437e83e0eb3…

MALICIOUS

PDF

75.2 KB Created: 2021-04-20 12:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aa20213b5cb45fbee86e5b3eba05001 SHA-1: af4f2d182171dbe72473ac4c8e9772cac69d91f2 SHA-256: e3d91437e83e0eb3ea343650e2589a08965b2cee1f7aaec5894cbd3c262a6ba9
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. One prominent URL, 'https://seumenha.ru/strik?utm_term=does+receiver+need+to+support+4k', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=does+receiver+need+to+support+4k
    • http://wirelessinfo.ru/88536491676pvox2.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/4d938755306d.pdf
    • http://ozalupa.space/55949620641jla81.pdf
    • http://koreanluxe.com/funny_animation_videos_download_freexln9m.pdf
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/rufubarijipexoz_wijajajozaluva_subepolibinala.pdf
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/loperoresat_xaliwun_direxamok.pdf
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/6da5ca6.pdf
    • http://voirly.xyz/xopabakesoxebilefexujepuu4lao.pdf
    • http://mp4.design/what_is_my_dpd_parcel2x5m6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinotugiwomo/renaissance_age_in_english_literature.pdf
    • https://s3.amazonaws.com/rimepusox/bollywood_movies_2013_full.pdf
    • https://s3.amazonaws.com/widuxade/96457008583.pdf
    • https://s3.amazonaws.com/bulolimepol/whatsapp_apk_latest_version_for_tablet.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/cnet_avast_antivirus.pdf
    • https://s3.amazonaws.com/tazopaju/what_is_12b_on_1040.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/gesoxemitedubuwevuzamon.pdf
    • https://s3.amazonaws.com/pegebunov/kindle_4_software_update.pdf
    • https://s3.amazonaws.com/levovod/mastering_astronomy_answers_chapter_11.pdf
    • https://s3.amazonaws.com/kozibowisenatu/radinapet.pdf
    • https://s3.amazonaws.com/zubuwujoxom/monitor_session_1_source_vlan_10-12_rx.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e6.bin
a52bb5412b583e625d1bb35cf78574be1faef171366d81d94e373b9c1cc43420		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 5036 bytes
font_01_sfnt_off0000fa35.bin
1fc6c2fb82a427d9bff9819a8203df999054c00b2dd1dfb4d78bb58b7d432c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 11048 bytes

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