Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca7229c43de3dd6…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 12:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4f8d0332c0828c13865db8306c3ca5d SHA-1: 8f9b703d320945f1cc40f22e41a01d3b6e239791 SHA-256: 2ca7229c43de3dd65ef6ab49469a1ef0c041b1fa0e06872e2bdf73a949f3ec93
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 0.9996

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://jacksth.ru/strik?utm_term=kirby+heritage+2+vacuum+cleaner+bags PDF link annotation
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/0383c.pdfIn PDF document text
    • http://grantmedica.ru/holly_high_school_skywardjyyyl.pdfIn PDF document text
    • http://uscarins.info/350659948954w81o.pdfIn PDF document text
    • http://femusawar.iblogger.org/how_do_i_change_the_draw_weight_on_a_compound_bow.pdfIn PDF document text
    • http://tryse.xyz/the_tale_of_peter_rabbit_book_coverfb9vw.pdfIn PDF document text
    • https://tiramanab.weebly.com/uploads/1/3/1/8/131856622/bazenopifimutar-lazike.pdfIn PDF document text
    • http://artelamp.store/498896320953w2hh.pdfIn PDF document text
    • http://1pokypki.website/arterial_blood_gases_made_easy5layw.pdfIn PDF document text
    • http://nout-prokat.website/bonafide_certificate_format_for_engineering_college_studenthc3ki.pdfIn PDF document text
    • http://ujjjrrrrr.space/autumn_leaves_trumpet_and_pianouezqd.pdfIn PDF document text
    • https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/a10762.pdfIn PDF document text
    • http://dazarutos.22web.org/john_merriman_a_history_of_modern_europe_from_the_renaissance_to_the_present.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fe6d4fbbd9a6.pdfIn PDF document text
    • http://ejinaya.com/nafesotujep52vs5.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/8173847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_60425ed8dbf54.pdfIn PDF document text
    • http://rikedodiveli.22web.org/biometry_of_eye.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukefuxatolu.epizy.com/70717821796.pdfIn PDF document text
    • http://bugudejekizukem.epizy.com/schengen_visa_form_france.pdfIn PDF document text
    • http://gogositanisewu.rf.gd/13478841272.pdfIn PDF document text
    • http://fanodawenu.rf.gd/are_cordless_miter_saws_worth_it.pdfIn PDF document text
    • http://luwunepozu.epizy.com/adp_workforce_now_training_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 5616 bytes
SHA-256: 1ee49f1d69adebddf85ad23cc472aeba634e11c77190181bf6a842f0aa9e146b
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 11228 bytes
SHA-256: 613773967722d527344969d150632eee3a014dcde72b1db53da3bedc1644f479

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