Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd15bf1a5e12212…

MALICIOUS

PDF

76.8 KB Created: 2021-02-27 20:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d3ae473de2a2cf933c09b83066a35ab0 SHA-1: e05b8259b236bd4940fa4f7c74133f832a9b08ab SHA-256: 8bd15bf1a5e12212411b74178c5613b7fa4826999a809f0465a316c5ce03d457
134 Risk Score

Malware Insights

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

The PDF contains multiple external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=what+are+the+4+main+components+of+a+computer+system PDF link annotation
    • https://wewowaxidibu.weebly.com/uploads/1/3/2/3/132303239/436ca5da561.pdfIn PDF document text
    • http://newberginvestmentproperty.com/simplenote_markdown_previewbc6qk.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/legend_of_heropolis_mod_apk_latest_versionzr1sy.pdfIn PDF document text
    • http://firstreadersclub.com/tuzunasikodolabikuwzzv.pdfIn PDF document text
    • http://alexandreablog.com/4374997449tfk0s.pdfIn PDF document text
    • http://bas-vorota.ru/caia_level_1_sample_exam8fnzu.pdfIn PDF document text
    • http://contact-git.top/54437019432adp9i.pdfIn PDF document text
    • http://coins24h.com/71692135126zx741.pdfIn PDF document text
    • http://auto-agents.space/45276583853xy2q3.pdfIn PDF document text
    • http://intekzafast.online/they_say_i_say_summary_chapter_7watej.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
    • http://turegipamikum.epizy.com/contour_lines_worksheets_free.pdfIn PDF document text
    • http://rakutekapo.epizy.com/49555719923.pdfIn PDF document text
    • http://kuzojepume.epizy.com/format_canard_enchain.pdfIn PDF document text
    • http://dowisekek.rf.gd/criticism_agency_theory.pdfIn PDF document text
    • http://xevazuguvapuj.rf.gd/telugu_movies_2018_jio_rockers_hd.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/how_to_download_audacity_on_chromebook.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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 5308 bytes
SHA-256: e4200b78bd77a23a189a4c4f507c1b86c87b575db5c62d457345d6edf31092b8
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10220 bytes
SHA-256: 378a142cbede7a4257c53d4f94e56c4d261a7b1b13293947c4f1e30e543bd0ce
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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