Malicious PDF — malware analysis report

Static analysis result for SHA-256 55239d9532a2e8de…

MALICIOUS

PDF

83.4 KB Created: 2021-05-11 22:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2ed344025c4fb2455246c2f244f835e2 SHA-1: 592cbe1104296fbe9faea82923c770ff30046844 SHA-256: 55239d9532a2e8de8489f9bb35a126d430a13e8ad6dba407fbbb00d48d4263d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://golowaki.ru/strik?utm_term=gre+test+dates+2020+maryland PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5fcbcbee899c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_600bcaa00f55f.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/16144720241.pdfIn PDF document text
    • http://cardioactiveitalia.site/d-link_dap-1650_wifi_range_extender_price2ohn3.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cancionero_catolico_peru.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/pbfgfia/angry_crab_shack_reviews_happy_valley.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/pTheFjc/rodabudupokemiwudawedanel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_60488d5d76cfa.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/add_watermark_adobe_reader.pdfIn PDF document text
    • http://copyright-infringement.business/the_creation_childrens_bible_stories_youtubeu0es9.pdfIn PDF document text
    • http://idealsit.space/spindrift_inn_652_cannery_row_monterey_ca_93940zljso.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/7a1a8ada-3d62-47d8-9369-836f2e6b3645/can_you_taste_chia_seeds_in_smoothies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b994e2-42a2-4581-9f25-9b637079c606/voxoxasijomifudimazamiwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e982960-b4ca-4c52-a9b4-2dfea999b2d0/how_do_i_become_a_reservist_in_the_philippine_army.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38946eb1-6c52-445e-a3a5-c83a93483fe8/which_label_best_characterizes_the_european_renaissance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ec0182-7344-4144-9263-07c0dc6793c6/jeep_grand_cherokee_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d24d178-a1fd-445c-be43-b08c91c37390/are_dunkin_donuts_munchkins_dairy_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50cce00-dd19-45d0-9850-4a8be42d96ec/mapifirefagixanapuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066ac7c7-6d73-44f8-a3b6-6b5c0d2db24e/latipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f087d211-200b-431b-a9cd-a79690788d60/who_broke_the_treaty_of_hudaibiya.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_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 5008 bytes
SHA-256: 011bff7979c1c478f4125561b6368323c487790c365ec09af5cb6385798daef2
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10988 bytes
SHA-256: c5a905b7271d921ae4cf8f72c37c1542cc40392f95949bb5b900054cf3e7580b
font_02_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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