Malicious PDF — malware analysis report

Static analysis result for SHA-256 5566d109ad156b6c…

MALICIOUS

PDF

97.4 KB Created: 2021-04-06 01:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d330fef89ca95643058d895c1b524c34 SHA-1: 174bec58c40ad256fe491c5732b57d529c99e684 SHA-256: 5566d109ad156b6c08c283af40d5fbb561cfec2e56363ffdc459eeb7ee375cbd
134 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. It uses an urgency-based lure. 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 0.9965

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dugedepap.ru/award?keyword=cholecystitis+etiology+pdf PDF link annotation
    • http://zobabikox.medianewsonline.com/ernest_hemingway_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hggf5DR/principles_of_management_for_mba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409394/normal_5fc56db3f0719.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/bmi_table.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_606acaace731b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fe7b81c1e0a5.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/dTgdPaC/kegafamepowo.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/hfKhjhe/30717689320.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/sahih_bukhari_francais.pdfIn PDF document text
    • https://cdn.sqhk.co/tumexifukevu/ghi2pHR/word_of_the_day_oxford_with_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/hcRijNa/gisunajosabifidijizufa.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/effective_java_4th_edition_github.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/how_to_draw_a_cat_in_a_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_60471af65b964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/womirofop/employee_self_evaluation_sample_answers_customer_focus.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/94551314401.pdfIn PDF document text
    • http://dafadewu.epizy.com/92092233203.pdfIn PDF document text
    • http://tulafixobokov.rf.gd/31192750122.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/jofowe.pdfIn PDF document text
    • http://pepajefosub.epizy.com/where_is_sim_card_in_flip_phone.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_81397862db12420d8b675b0343e0a899.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/40369287985.pdfIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_77aed901d564442fbc927aeb9c71fca8.pdf?index=trueIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_1a10d6350bbd49a0a4dc7474d084d7e8.pdf?index=trueIn PDF document text
    • https://300a1258-3b13-45f7-80b9-bd8966f45320.filesusr.com/ugd/81888a_25696b111fde461bb270db44b45f41a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/titrasi_alkalimetri.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_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 5120 bytes
SHA-256: 2ab912e0ab8d8d93ccfdca31907451b14a58aec7ad5018b1778d717d62f62ced
font_01_sfnt_off0001508f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508F 11196 bytes
SHA-256: 9a17be9f3ddbaba4e9ab78b9eae04dc90437361ef9070ee92c80e7c1be36176a