Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5a5d7b6bc7db9a…

MALICIOUS

PDF

95.3 KB Created: 2021-04-03 13:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f97a79b244b04dc650eefdb1dcf8ab4a SHA-1: 55c00c9c65ed57912501eb22134c8ec350371e2e SHA-256: 4d5a5d7b6bc7db9a811dca1e8b5fa5e3afa2c9b61d0f9cf5eb0d2dc7473b6845
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://zajinet.ru/wix?keyword=maryland+all+state+senior+chorus+2020+results PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377706/normal_6049b766b42c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_6019213a8c089.pdfIn PDF document text
    • http://samozanyat.info/50059131425czpyi.pdfIn PDF document text
    • http://ladukusuga.22web.org/55338313756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_603feefc59ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_601d5895d25a2.pdfIn PDF document text
    • http://xeeewq.xyz/trail_climb_hack_apk_obbv7iyu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff15ba4522bf.pdfIn PDF document text
    • http://rutakaganutidu.22web.org/automate_the_boring_stuff_with_python_programming_download.pdfIn PDF document text
    • http://pexiwaz.iblogger.org/cockatiel_bird_care_sheet.pdfIn PDF document text
    • http://cardio-natural.info/google_chrome_free_filehippo55tra.pdfIn PDF document text
    • http://top-agent.ru/507468927084h5oq.pdfIn PDF document text
    • http://copyrightsupport-ig.com/descendants_3_google_drivey648x.pdfIn PDF document text
    • http://atlas-copco.su/boletn_informativo_de_rentas_internas_18-_24vnwyo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_6056f150434ef.pdfIn PDF document text
    • http://zuwatujusuz.22web.org/nufezabeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fd80ee82db7c.pdfIn PDF document text
    • http://stopnutristrike.ru/gotizukogorunemes8bm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_6051a73558fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_601f027ca0afa.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://oblakova.ru/gisotikuxuwefoey2id.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukixewagiv.epizy.com/how_to_use_multi_time_frame_analysis.pdfIn PDF document text
    • http://pezuxegoweniger.epizy.com/sonozidikatukagix.pdfIn PDF document text
    • http://tegegizupe.rf.gd/nisuku.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_off000133aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AA 5408 bytes
SHA-256: 203d63d9831cf66dabd69c90ab65313518dc3bcca1187f64ff1b7230f9955758
font_01_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 12448 bytes
SHA-256: a4ee1036461f78119b586071a29031308d9cedbdb77d78d26ecf0f33cf4a2250

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