Malicious PDF — malware analysis report

Static analysis result for SHA-256 9370838662c595a9…

MALICIOUS

PDF

74.6 KB Created: 2021-05-10 19:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 12f1a457edb522ad923c60f7a5c3c8b8 SHA-1: ead1732b049363a3639acee308f4745ca499135f SHA-256: 9370838662c595a97179e19666b1368c29babe79e0118804a4d71f35d264df7e
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to unit conversion, likely directing users to a malicious site via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=cuanto+es+140+gramos+de+mantequilla+en+tazas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387702/normal_5fe27bd2386dc.pdfIn PDF document text
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/fugikavemufopavexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_603fcfb860666.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/lasers_and_feelings.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/69301612199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_6057d202ac06c.pdfIn PDF document text
    • http://1xbet-registr.site/jevudafivewemowosi1gm1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fe412c573e10.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/kamus_bahasa_arab_amiyah.pdfIn PDF document text
    • https://kofiserifopame.weebly.com/uploads/1/3/2/7/132741397/f9dd8309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5ff9dc5ec02b3.pdfIn PDF document text
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/2994240.pdfIn PDF document text
    • https://pudodogefelareb.weebly.com/uploads/1/3/1/6/131606347/d58e0e94476f0.pdfIn PDF document text
    • http://vinorama.fun/call_recorder_free_videoizzul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_60111626544ba.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/0108ab43f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefokirof.onlinewebshop.net/bukes.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/1391482238.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/agada_tantra_books_free_download.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5508 bytes
SHA-256: 4c3e57b2334a3caa654cf2aa4082a3ec2b5d662d21b8cc0e9c3042959e2933bc
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 13080 bytes
SHA-256: 4f443100bf7bca8e52499415a7f4efa27bbfcb7258a8aa3b6898eab6b4194429

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