Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b32bfa451dd52ff…

MALICIOUS

PDF

76.5 KB Created: 2021-05-14 21:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 13265dc8d7d429d2a5d2be63c636b6b8 SHA-1: 2a5067fb3cac17d8b320ab0698bc3715b06f48c1 SHA-256: 2b32bfa451dd52ffaa0d5aad2b9f1c4a7236ed8ab6c7008ea2fa5fbf5a13c709
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The primary URL, 'https://baarspo.ru/strik?utm_term=carb+cycle+meal+plan+bodybuilding', suggests a lure related to fitness or dieting to drive traffic. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to web traffic generation or potentially phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=carb+cycle+meal+plan+bodybuilding PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481064/normal_6031b7a39a8b3.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/donifarelasodot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_602f27c4f2c47.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/sogipek.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/mushoku_tensei_anime_release_dates.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/futopateli_maxoroki_devujitaxirapi_laxoxidufixum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_602c454e9e947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_6034f11a50e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_606c8ca583bac.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/7725237.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/06e3d310266d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5fe969d47e602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_604ce32b14695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_6009c5e806e67.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/fejakixoweka/43597985597.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/rifoxadik.pdfIn PDF document text
    • http://fefadipif.rf.gd/gojunuwenakix.pdfIn PDF document text
    • http://rowagaparik.rf.gd/lorijexonu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/twitter_profile_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/lifesolosinobafaw.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/tolumiwam.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/nojoresututavupigo.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5360 bytes
SHA-256: 4327c4a5e5a3b43ea45b662a54c33d04d4940152b5c766ec584ceaf9e2f99891
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 11124 bytes
SHA-256: bdee990b8313a81365e1b6fb821b7a1eebfa66d276473039f9e4ff9d99c925cd

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