Malicious PDF — malware analysis report

Static analysis result for SHA-256 6588c3417692651c…

MALICIOUS

PDF

73.0 KB Created: 2021-02-17 07:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e98b940fd89360b07ac1a1c0447ed66 SHA-1: 89670478a5c50d97a535ebadc3a5bb44f98ade6c SHA-256: 6588c3417692651cc0f30c84a1329a3ec512a2a1cb12673af74bc50cef3e5fc1
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=d%2526d+5e+gamemaster+guide+pdf PDF link annotation
    • http://mifopevoruroga.22web.org/21179715803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_6006ded4420a6.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/hdjghhY/sing_karaoke_online_karaoke_record.pdfIn PDF document text
    • https://givurubikuz.weebly.com/uploads/1/3/1/4/131482907/f05fdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5fee00a7ed4a2.pdfIn PDF document text
    • https://naruvoraxosu.weebly.com/uploads/1/3/0/8/130873998/sedegikubamuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/Uhahcd8/15368032460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_60252565abb30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5fdb1cc3c2cdc.pdfIn PDF document text
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/dojugedo.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/gcfWRih/fopawojojewanepuno.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/Z8gcier/83560099472.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/HCMhdji/didi_n_friends_lagu_baru_2020.pdfIn PDF document text
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/4529540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojapamun.epizy.com/demo_warlock_guide_pvp.pdfIn PDF document text
    • http://lijobexabip.rf.gd/34057257314.pdfIn PDF document text
    • http://fepevakadiw.rf.gd/is_there_a_plural_form_of_advice.pdfIn PDF document text
    • http://bipedok.epizy.com/how_do_you_pronounce_chiari_1_malformation.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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 4156 bytes
SHA-256: bae8c65fbb2985f8f9e3f3f2bcf16a0f9e8e1e4a7d5ebf1135d71e3fbc9ddb2e
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10224 bytes
SHA-256: c54f0fa34071c8c4215d848fff6c1d84e7606e861fcfaad4af353d31cf76946b