Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e144f923d1b3864…

MALICIOUS

PDF

73.7 KB Created: 2021-03-21 02:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 196d2d4874ebbf90c5bfce9b8c02095f SHA-1: 911167c85170aa9e1bd517ccf165ae4fe3308ecb SHA-256: 4e144f923d1b3864c94945668df6c8d3837a8f1567f5b263d421374867ce02d2
164 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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=cleaning+schedule+template+excel+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375355/normal_601127fc21f1a.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/zidova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_6016120e1e14e.pdfIn PDF document text
    • https://gonaxazurunuta.weebly.com/uploads/1/3/0/7/130739517/8930591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6009dfe384973.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/towakog/93178984035.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/metarhizium_anisopliae_control_biologico.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/badmash_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/rejawimofu.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_986fd9c006b54443ae8d56de78f4b180.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_14d4a594d8f542cf89e9019e1cd13c1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/catalogo_hinode_dezembro_2018.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_4266fe41a8c545f9af525af18da958f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/what_are_the_effects_of_pain_in_chest_when_swallowing.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/patimomoratipizumage.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/sifejojumodusib.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/cadet_college_pasrur_admission_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/badoo_baixar_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/kubernetes_deployment_volume_claim_template.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_24fdad429b4443f09a57c753aa01f3f4.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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 5540 bytes
SHA-256: c6123830f1426db3bdbc8e2f397dd6f9a736ca25d0b7013360303e857577273e
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10016 bytes
SHA-256: 7b3749b8a0a53ad19ddc428feee7454435df4c4f7d5a7daccc13c649ebe426ab

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