Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a0d981727ed316…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 04:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7141bea84249a2cbd34ede26fff19c2 SHA-1: 80afede1e284c3674ce218f16de4bce44a127bb7 SHA-256: 87a0d981727ed3163283dc23441bedca3ee9d1c5451bb041c31b46a745eeec00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a primary suspicious URL pointing to a domain associated with phishing or malware distribution. Heuristics indicate a link farm and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=bartlesville+high+school+calendar
    • http://lefibipefazefep.mypressonline.com/vawurufe.pdf
    • http://bebosebe.66ghz.com/83931985390.pdf
    • http://vutomifewomisub.iblogger.org/what_is_sarah_from_dance_moms_doing_now.pdf
    • http://forovasax.medianewsonline.com/zumurujoraneguxasapige.pdf
    • http://gesabagipo.22web.org/jabukukatemamem.pdf
    • http://sujabupinoda.scienceontheweb.net/88025964198.pdf
    • http://sukujugonada.22web.org/adventist_choir_songs.pdf
    • http://muvirire.22web.org/difawisuledurid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_eee9130fa1004ca8a3d3cdceaa237965.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea1423d5-711b-48d9-a17c-708749ae4667/how_to_use_ge_advantium_oven.pdf
    • https://uploads.strikinglycdn.com/files/a038693d-f3a5-403f-b0fc-914f141b5a25/britax_boulevard_2013_expiration_date.pdf
    • https://uploads.strikinglycdn.com/files/088f2128-ccb5-47e3-9323-89d04b7ddbf7/ribefakaj.pdf
    • https://s3.amazonaws.com/wizakokowe/74791762540.pdf
    • https://uploads.strikinglycdn.com/files/2e687ce7-aa98-4a1b-8391-7f1ea7b352e9/93192574771.pdf
    • https://s3.amazonaws.com/ritoma/58403473454.pdf
    • https://s3.amazonaws.com/mizeteb/manualidades_divertidas_para_nios_de_primaria.pdf
    • https://s3.amazonaws.com/sajezife/unication_g5_scanner.pdf
    • https://s3.amazonaws.com/gogoxowiniza/xedokodevetemoxexerejig.pdf
    • http://jofijegisa.atwebpages.com/canada_passport_child.pdf
    • https://s3.amazonaws.com/fowikorejodi/kexakatibufoke.pdf
    • http://ledaruwevegoxu.onlinewebshop.net/definicion_de_administracion_hotelera.pdf
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_5e7b58146fc74204ba92784a77a4aa3d.pdf?index=true
    • https://s3.amazonaws.com/liguwubore/derunigonu.pdf
    • https://s3.amazonaws.com/juliziwojatige/bemupig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f858.bin
6f146d57530dfb0cd962ff7eac361f3258679f81444e20f6a89efe36daa5b9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 5308 bytes
font_01_sfnt_off00010a67.bin
e3c8af1ee36b018de5088c0f6099f0d0346f428b79749c11b60a44f055ea153b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 11184 bytes

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