Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35092f0fce15796…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 07:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 843f3be1460f5830036fb3ff7b484ead SHA-1: 732ae5abbe40dbbf4204ac01eb0998ff669ec3e9 SHA-256: f35092f0fce15796f53593a91f899e9ce22f552ff1f1a379f139eca8f1c82095
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. One URL, http://bradzo-ep.com/uploads/files/seburimafimupowumu.pdf, is particularly suspicious as it is part of a link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://bradzo-ep.com/uploads/files/seburimafimowumu.pdf In PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/53182600412.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/49720430577.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/62217897303.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/77648667195.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/bidufibopudetekazidogap.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/kiviresuxinamur.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/25527083971.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/tuvidavawinu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rozewivomubuwozavetuzig.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/76254340088.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/564dee5f81b5782da3432089eeb29768/47801182872.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/butedunikeni.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/20201380914.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/fewaxuvivoge.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/32062393146.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/sovexipawaf.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/23355186266.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/podd5ntuc1dn6a78p8o4fnra0d/kuguta.pdfIn PDF document text
    • http://pileki.com/imgup/file/85223358289.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/69709642147.pdfIn PDF document text
    • https://spacio.hk/attachment/file/77752069568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+office+season+1+watch+online+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 17820 bytes
SHA-256: b25416a080364e81930a540f951aacb6efcd9bba0b0c15addef1e9bed041fd57
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 10532 bytes
SHA-256: 8f630d31127b40f79d7166902e1f45c3340906c8068e4e9924ab9e69af6a263c
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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