Malicious PDF — malware analysis report

Static analysis result for SHA-256 247b9d82614e04cf…

MALICIOUS

PDF

71.2 KB Created: 2021-04-25 01:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 48c9043146a8709ccc387b5db8030f2a SHA-1: 5cd7e47beab92014f37682a9835e14f2b5c41106 SHA-256: 247b9d82614e04cf1e63be8ba496e4c12b26f2500908c05f6b2cbd28ad25515e
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/strik?utm_term=army+combat+lifesaver+course+recertification+ppt PDF link annotation
    • https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/3466217.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/hiSjgfT/55566529915.pdfIn PDF document text
    • http://fedogiki.22web.org/mapisigorovijudumexa.pdfIn PDF document text
    • http://noxesim.iblogger.org/ca_cpt_exam_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/lazaxosu/geghlIb/download_ragdoll_rage_heroes_arena_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/giiedjh/gomaf.pdfIn PDF document text
    • http://merovew.xyz/pioneer_avh-4100nex_password_reset6hapv.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/ifSMAc3/bravelands_all_books.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/EhfThf4/brain_over_tricky_puzzles_apk.pdfIn PDF document text
    • http://my-credit.info/istanbulun_fethi_slayt654ue.pdfIn PDF document text
    • https://winenexosipagep.weebly.com/uploads/1/3/2/8/132814343/3179454.pdfIn PDF document text
    • http://inscarusa.info/what_type_of_oil_for_2011_toyota_rav4innix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_f6d135afac19467a8b504b72bb3ee1dd.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_63a621f3f68f4b1aab34224423c67fb5.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_4907975a447a403a8e1b58e288aa34e7.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_544c58903a92421c911e48b9845be8c6.pdf?index=trueIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_d151f4c566d64fba928698741af0204d.pdf?index=trueIn PDF document text
    • http://woxanegerofokox.rf.gd/bevel_gears.pdfIn PDF document text
    • http://gadoselegi.epizy.com/84088439253.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_f718cafb940e40448285505f455849b3.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_856444c882914b1fb2e020a10235c054.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_30b9621483db4f6d9dfaa8a0497cc33c.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_54f6444bfad24e16acae4be7c79e6762.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 5452 bytes
SHA-256: 386fb89c0a0dd7eaa2850cd303f2fef6357a6d931d34a3715a4b7713cf7bc463
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10576 bytes
SHA-256: c49e39004077effafb7adad6c999bb3a22c7a9c21358b24e9443b49e7eaa5b00

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