Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f908cff9b4fcee5…

MALICIOUS

PDF

79.1 KB Created: 2021-04-17 13:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1de396a9029609aaff6f55b0150312ae SHA-1: 22dda33e4a15f5c05e4e9e05670e441ff41318f2 SHA-256: 8f908cff9b4fcee5b321e6f4edb9a8e93e577ead84c4daf3f959b3177ced517b
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 0.9998

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://botokaw.ru/strik?utm_term=bell+hooks+books PDF link annotation
    • http://bolipoloweda.mygamesonline.org/atal_pension_yojana_form_canara_bank.pdfIn PDF document text
    • http://promoocaoameericanas.com/minerva_mcgonagall_actressuag5l.pdfIn PDF document text
    • http://llloooodddd.space/does_sora_like_shirod4hkt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6044cf610a149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_5fd9d7b036ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_6056ed5d421fd.pdfIn PDF document text
    • http://securityverifiedservices.com/xipufo5q6k8.pdfIn PDF document text
    • http://checkmycredit.info/64932308743cwz.pdfIn PDF document text
    • http://trendmobile.ru/1072173802p1o1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_57052f0725424a71a0f2570a2600a137.pdf?index=trueIn PDF document text
    • http://roriwejoti.epizy.com/old_mr_boston_bartender_s_guide.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/operation_research_assignment_problem.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/liwofunolijesute.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/gubamilapexadibolazidoka.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_438541e962d24e139d6987084cbad32d.pdf?index=trueIn PDF document text
    • http://jezitezeveveta.epizy.com/pijosodekixexunotilizevol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 4276 bytes
SHA-256: 13ca87da050f0bf9bfd368d92992359622523e6e6ec04ec6ef0263de1d739986
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10784 bytes
SHA-256: cc7297280c0810f381fedf7d571b5a1c1fac5ef94d444e492ccfb1253037d50f
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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