Malicious PDF — malware analysis report

Static analysis result for SHA-256 56de6138bab0c1ff…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 19:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b44613655fb0a76756fbc3c75d6f65ba SHA-1: e79b533c7ae8caab494315b31a544822ddd15f3c SHA-256: 56de6138bab0c1ff216dd701b538e026d334ea6e44713f5ae878010aa6f0086d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent link pointing to 'ponafet.ru'. This URL, combined with heuristics indicating a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this document.

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 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://ponafet.ru/strik?utm_term=how+do+i+connect+my+syma+x5c+to+my+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454543/normal_600be36f49b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5feeb1dab860d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5ff49749b0ab6.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/spirit_blossom_thresh_bundle_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421058/normal_5fede88786c67.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/bisedumexanubexelula.pdfIn PDF document text
    • http://letgtma.bid/gitubasafumumz78n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5fd7f0c3425b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_606885527893e.pdfIn PDF document text
    • http://youralteragoods.com/bimofimxn082.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/betamazusinef.pdfIn PDF document text
    • http://invitesistem.ru/avett_brothers_brooklyn_song_lyricsqfq4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fd9ceaeae6ed.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/expert_system_ai.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
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_17eb333a10494de59c9d8848d591136e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afa72e1-0b11-4541-bd03-7855f51d88a9/alfreds_piano_101_book_1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b1e8a4-c31d-459c-9910-30cde10353df/how_to_get_fl_studio_for_free_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6e9ea6-58fc-475a-9625-edb14faeb0e4/vomipediseb.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_954b8f519fa14e93946f061f2c1d87b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b37cc94-ce8d-4a77-a5c8-52abdaa5253d/43259706019.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_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 5320 bytes
SHA-256: 26605bdfd8c92a62d4945e9654b51fe69e85f5dd8703d516ecd5ae89739614ff
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 11056 bytes
SHA-256: 43589f88d3b08d2e80755818d521ae3e3a550bf1972f863077f1143364cfc8d3
font_02_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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