Malicious PDF — malware analysis report

Static analysis result for SHA-256 7626a96adfa3a55f…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 19:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4084667ae0b4d02d3d24169a4803642 SHA-1: 50c3bd0e6917253aeb35c8d98b80814b44840bc6 SHA-256: 7626a96adfa3a55fad4e7d70f30f29ac3d9dd20b14985b5bef8672460deb72e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://dafemum.ru/award?keyword=buku+tentang+bahaya+merokok+pdf PDF link annotation
    • https://cdn.sqhk.co/zevukodixu/hgwsjjb/32295175230.pdfIn PDF document text
    • http://fruit-ita.fun/how_to_watch_youtube_on_kindle_paperwhitentgnt.pdfIn PDF document text
    • http://mpvideo.org/origami_bookmark_animals7gl06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fe225a5341b5.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/ihpzCid/bounce_tales_game_jar.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/DjegeN2/philip_kubicki_bass_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_6016b77cd11ac.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/geiagiU/defina.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/hiTggHF/stickman_free_fire_survival_battleground.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1ce7f8-da0a-4714-8ebc-e434b8e5f981/stanley_fatmax_powerit_1000a_review.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_a36277495bc141c8ad103f607fea67ad.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_24ac577a1ef74a4ab63d5e172db41fe7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/rusoxowefuxezuj.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/clash_of_clans_windows_phone.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_a5b72a6ee3074e028bd3d6c22f22abbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9e23f6-a5d7-483c-b54e-e7b7d1882966/metodologia_de_la_investigacion_por_que_es_importante.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c303844f-9c94-4ff2-9383-9417fae6410a/database_security_issues.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/the_cartel_ashley_and_jaquavis_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/turetoditatu.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/xuwobawozemotu.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_cf7e15e63b2849e3881acc760bdd5a40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd2224b-5e90-452c-b041-e17c527a857a/casio_g_shock_compass_ga_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59282755-5def-4074-900b-f94385349b2f/how_to_google_my_maps.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_12a844c7dacd492fbc32d1a9c9c53041.pdf?index=trueIn 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_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 5600 bytes
SHA-256: 0efc20e56176e8d39999aeef1eeb4da045a8fd873b043ce7aa8390dba10b1c74
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10428 bytes
SHA-256: 57a7c31b0ea3efc4a7ed1c1aa3814c599b3cc8485cf93112112bd376dabc188a