Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9816a6221bc3c3d…

MALICIOUS

PDF

74.8 KB Created: 2021-05-20 13:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c915bc1d7f42431d67a35227f02f8443 SHA-1: 99ccdeaf80cda19809596455c527d749520cba07 SHA-256: d9816a6221bc3c3d3e33db5a14099cbe8773f3c892d547b88d7198e0b095d003
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The primary URL, zajinet.ru, is associated with a search query for installing software, indicating a potential lure for phishing or malware delivery. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+install+ms+office+2007+in+windows+10+from+pendrive PDF link annotation
    • https://kebegaxarebewu.weebly.com/uploads/1/3/4/0/134096812/7619353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_605d85033abc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_60347b3ddcfaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5ff1e02cda8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_60668fdc9073c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_604b3ff76e226.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/vatujonuzipuj-rozesizadijuxej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5fe58a47dee5b.pdfIn PDF document text
    • https://pakokapixufepu.weebly.com/uploads/1/3/4/6/134659136/747260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fedaa64389f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_604e900a3661b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_606a2e133e40f.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/pipaneku/far_east_global_group_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/rirewojan.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/what_is_slow_gut_motility.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/reportage_civilisation_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b488b58-9f1e-4b74-ad81-fbe8f5602b5d/mejores_cursos_de_ingles_online_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b925dd8-0b6d-428c-852b-7df2fc2ab642/selina_biology_class_9_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/setup_motorola_surfboard_sbg6580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae1a8a6-4c7e-4002-a959-c5b5141b2d3e/bizarufukokubobuzanim.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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 5820 bytes
SHA-256: 7687064e118ae5664df1a0b27ffddf6a96a0ff41ed42bde9731d6fcf3ac6bb94
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 11796 bytes
SHA-256: 92e86db51b1bdc96b10ceecffec2df0181298ee99fe95cf933df52cb8239c381

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