Malicious PDF — malware analysis report

Static analysis result for SHA-256 73629de7c38346f5…

MALICIOUS

PDF

83.4 KB Created: 2021-04-20 02:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1b7df0e7e0e87b472443360a860ffb8c SHA-1: 589b1559fcba2c2e25e7d9761ebf5e2c809b7c1b SHA-256: 73629de7c38346f5f261a6a018fd3ffb7a9be99c57403d48d2c8a5a55e69f772
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/strik?utm_term=why+is+septuagint+called+lxx PDF link annotation
    • http://kersita.space/kekabudumodp54p4.pdfIn PDF document text
    • http://metalllift.ru/bozokifubevarujobatepovipp1hzh.pdfIn PDF document text
    • http://goldalbum.ru/what_book_of_the_bible_talks_about_marriage7jsea.pdfIn PDF document text
    • http://com-free-fire.com/juxuwojevtue6u.pdfIn PDF document text
    • http://italy-small.space/juxewuleditenaleex41q.pdfIn PDF document text
    • http://2020coupons.info/15044140434habtd.pdfIn PDF document text
    • http://jusapp.club/xabufejs1tsx.pdfIn PDF document text
    • http://guitar.su/nogati7i30k.pdfIn PDF document text
    • http://1xbet-registrat.site/1380527533636ynx.pdfIn PDF document text
    • http://topsol.xyz/pleasant_hearth_pellet_stove_igniterskuae.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/nukunazatazinofepuk2ptx4.pdfIn PDF document text
    • http://dombitarf.ru/desuzizubedinizajamutewa9yl0x.pdfIn PDF document text
    • http://it50discount.pro/riwigunewaxamemruh3.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.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://uploads.strikinglycdn.com/files/4a8857e5-1f74-4ce0-9cf2-e2961213412b/mp3xd_gratis_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3fdf8a-6bfe-4d53-949d-d56790931692/the_voter_by_chinua_achebe_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7418d061-7675-4c62-841c-0bd8e3c45141/what_is_the_concept_of_co-creation.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/9050206988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde5d448-b9b3-455f-ae15-5310620f9e3b/stephen_king_on_writing_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c230f9-0d74-46ca-bc6c-f766ea30905c/2020_ieee_9th_international_power_electronics_and_motion_control_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/adminlte_template_laravel_5_package.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/how_to_install_chamberlain_universal_garage_door_wireless_keypad.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/kebeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e1e4a7-df49-41f0-835b-a861ac85b331/beseler_23ciii-xl_enlarger.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/doduvulekusasuveleromex.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_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 5196 bytes
SHA-256: 1553e90f6965106c2143227d3ae0350ce721681b484b7920141567544814648a
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 10412 bytes
SHA-256: bad3c0912fdf4d8a01c8e150b7dd6e38135ce7a937dd5e6845d418c6d035db19
font_02_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34