Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe65f16b53f12e6…

MALICIOUS

PDF

73.8 KB Created: 2021-03-28 15:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f6e1ac3fc2cbb83a9107a310c38f6e8f SHA-1: a8f842c88c987ff99da5d014d0769891042ce3eb SHA-256: efe65f16b53f12e642b129c0b020f4ad31832c296caf43ddf78b420aa8224155
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. These external links, such as http://rebelliona.online/62326775539jfmxq.pdf, are likely used to distribute further malicious content or conduct phishing attacks. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cdn.sqhk.co/mogowepuw/ehuhgDb/space_marshals_2_how_to_get_100.pdf In PDF document text
    • http://rebelliona.online/62326775539jfmxq.pdfIn PDF document text
    • http://obuv-kozha.ru/ironstrength_workoutzt841.pdfIn PDF document text
    • http://wersita.space/10383927513obxvi.pdfIn PDF document text
    • http://axecheat8.xyz/44874844928w5vex.pdfIn PDF document text
    • http://gilitomenuxame.22web.org/munaxivetixagisuwoda.pdfIn PDF document text
    • http://verenica.net/zikelavijuwitalopidider5re.pdfIn PDF document text
    • http://meetplafond.xyz/7186401659t76qr.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/hidschd/bapomiji.pdfIn PDF document text
    • http://radulifivezej.iblogger.org/2920955356.pdfIn PDF document text
    • http://instofficial.online/teach_like_a_champion_2.0_table_of_contentso5hta.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/dfifjgg/gixawesa.pdfIn PDF document text
    • http://ekzo-fruit.ru/redline_select_flashlight_manual1fcl0.pdfIn PDF document text
    • http://idealica-ufficiale.site/73813818601k34et.pdfIn PDF document text
    • http://taptopbot.com/kotlin_android_recyclerview_adapterg76tm.pdfIn PDF document text
    • http://olx-delivery.cc/72924758886af0xa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=6%20pPDF link annotation
    • https://uploads.strikinglycdn.com/files/9043c9d6-6504-4b12-a285-88744f59253b/79051304503.pdfIn PDF document text
    • http://fudotebu.epizy.com/metabolic_dysfunction.pdfIn PDF document text
    • http://mafofeguf.epizy.com/padepit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd832a0a-5e93-447c-ac7e-9d2c072303d9/17727917044.pdfIn PDF document text
    • http://bidovug.rf.gd/sewurax.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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5296 bytes
SHA-256: f13cfd5fd099066324091f097024ae746c232ae057ab65674708a12b5b7d55f7
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10264 bytes
SHA-256: 9dc8baacc9d9994c0a2fd555696b0e51667757e9e29ec8af9111b730e276bbc4

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