Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a73ba2ab7f469f…

MALICIOUS

PDF

77.7 KB Created: 2021-02-21 15:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 79988140b482b05bd8f4cfc29de71f63 SHA-1: 1b56f6d7c9a67ada550ea4ce73979eacfd4c2f25 SHA-256: 18a73ba2ab7f469f6fd6fe377ba4384badf5e3f9067c1c7dd3234a3ac2ae7e58
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious websites for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure and embedded URIs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=why+will+my+snowblower+not+start PDF link annotation
    • http://fishland.store/economic_nationalism_definition_world_historyzhs6l.pdfIn PDF document text
    • http://mirror-x.org/rascal_full_movie_freeoxnkr.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/iiRgewi/mr_guns_and_gear_real_name.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/JjkidKN/tv_show_24_ringtones_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bujedebi/jhih2he/mebowexop.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/auUgjhi/tap_hero_2_mod_apk.pdfIn PDF document text
    • http://vsspb.ru/13162789175lqwxp.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/4hiakgi/36902581879.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/ifjfieD/72790036652.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/chahcLL/slack_download_android.pdfIn PDF document text
    • http://trokot-online.xyz/21659807765mh1sk.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/dujcid4/spirit_runner_gallery_taos.pdfIn PDF document text
    • http://labiosdewonda.com/repufuxowopupezunupz8ju6.pdfIn PDF document text
    • http://atlas-copco.su/18158286838gcsjs.pdfIn PDF document text
    • http://blekrossi.ru/beach_head_2_game_freek72q1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jadere/74634651397.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/aswb_practice_exam_questions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5060 bytes
SHA-256: 4561fb3f0bb388a7bef1f2be4df067a5708e64bb10fb2a55ddb10505f3159310
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10080 bytes
SHA-256: 193be032a71e13d6da6914b9dda4c3fe293aa32aaf8bab53c729bad1d4ff37fe
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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