Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ccf016f86200c3…

MALICIOUS

PDF

77.5 KB Created: 2021-04-15 16:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d2198b486648ab0ef6c6b2c4f31ff59d SHA-1: 515ff21707bf4ca9db5710b75eb9e31817987cf4 SHA-256: 55ccf016f86200c3cc64dd6819034ce379a74428f26dfdc41ff2925674d5b7f4
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 0.9997

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://vilenefex.ru/strik?utm_term=what+can+i+eat+on+an+anti+inflammatory+diet PDF link annotation
    • http://eslife.pro/8874779897344qa7.pdfIn PDF document text
    • http://gtomishebs.xyz/omron_body_composition_monitor_with_scale_-_7_fitness_indicators91fsu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_601884fc80859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_600b6a8d08de3.pdfIn PDF document text
    • http://wiwomadexuza.22web.org/4860169130.pdfIn PDF document text
    • http://riwejurefuwubep.iblogger.org/7_ages_of_man_poem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_6020730341a2b.pdfIn PDF document text
    • http://jumbochecker.com/adobe_premiere_pro_cc_2017_download_softonic8bbj9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_6002e6b92d699.pdfIn PDF document text
    • http://zexawof.22web.org/cissp_official_practice_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_76a5da1048e94784a584beb48725c103.pdf?index=trueIn PDF document text
    • http://kufitaxasatuze.rf.gd/99632642316.pdfIn PDF document text
    • http://zukovijaxi.epizy.com/bibliographie_commente.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_6b5450682acf458db17b153b6501ea44.pdf?index=trueIn PDF document text
    • http://semerobaragizeg.epizy.com/pixowamevuloxuvegapuw.pdfIn PDF document text
    • http://wivufaw.epizy.com/30999479304.pdfIn PDF document text
    • http://midiwajuwesi.rf.gd/air_force_1_shadow_pale_ivory_australia.pdfIn PDF document text
    • http://lorovaxejavagu.rf.gd/how_much_can_a_jeep_cherokee_v6_tow.pdfIn PDF document text
    • http://wetowotupime.rf.gd/64772152017.pdfIn PDF document text
    • http://negatesuxa.epizy.com/71122996153.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5196 bytes
SHA-256: bf459f6f4959fd67da8682dd27996ff896e46d2d5f00ffb7805d7ca06642fe6c
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 10816 bytes
SHA-256: 4ae3c977c8f49b73398674016f04b64d6683c9ff2e620193cb55fe23edbcb4b6

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