Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa1ca88f5367261…

MALICIOUS

PDF

77.9 KB Created: 2021-03-29 14:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be5d16aa6d3f3c751747f2978664d2b1 SHA-1: 152c36d5cb5bd8ff2d2b34d417325c8581bf4558 SHA-256: aaa1ca88f53672614044822740227f7c1d33129e3b70f35b10fc7355195cef8f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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://kuzutuzo.ru/strik?utm_term=digital+photography+for+dummies PDF link annotation
    • http://talakam.space/240703824710k0ss.pdfIn PDF document text
    • http://7lessons.space/42908358561n92cx.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/ijhheI4/nutritional_information_chicken_breast_boneless_skinless_grilled.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/best_christmas_trivia_questions_and_answersu8gos.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/bgi2fCX/15mm_napoleonic_wargame_flags.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/gopro_hero_3_portable_chargerr59cc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/iijPuhe/polly_pocket_pollyville_super_slide_water_park.pdfIn PDF document text
    • http://takimopunize.22web.org/naruko_tea_tree_sheet_mask.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_601b85402496d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600fb664a3e09.pdfIn PDF document text
    • http://firstflirts.site/fervent_by_priscilla_shirer_study_guide3fe3n.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/jehBldx/screen_recorder_no_watermark_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimoretisew.epizy.com/business_development_report.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_dc42fe01ff694cbe83f0f9ec5d30881d.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_8de3cd186c224f0898bdc7fe012663ec.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_d89ffe1e94d547839ab97043fed89ca4.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_7bcd3899fbba4413877622d3c753353c.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_3e0fa5d1a39e48cd85e2532e3a515c11.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_93f10f3079f440bfaa5e73aedd68aa6b.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_8aeac00f6a064e83ae6fe70df3f42315.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_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 5556 bytes
SHA-256: 7423c9a201ea7a77fd77e8bf381bbc14a2a78a0befab0d75548dbe7c24513922
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10724 bytes
SHA-256: 975627b9f2c8db2bba60f09fef244f151e0433927b17f0f2d59210a844e6dfac

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