Malicious PDF — malware analysis report

Static analysis result for SHA-256 5038ab4b7bbe85d2…

MALICIOUS

PDF

80.2 KB Created: 2021-10-04 18:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e1877828b9e752486c4265d9f5fb9c6 SHA-1: 25ad15252135766541cc1ed1f04919f02a23ff88 SHA-256: 5038ab4b7bbe85d2d25cf1062c4c5e10be81e137a24dfc79005ea122296145f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of many URLs points towards a malicious intent to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=fruit+salad+with+sour+cream+and+condensed+milk PDF link annotation
    • http://zlhk.ru/upload_picture/file/84106819273.pdfIn PDF document text
    • http://uchid.com/uploads/file/womokemomitulubesogazo.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/95636536320.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/sazetirakukosepijebo.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/87159415778.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/092ed20923a2b8442d2abafde8cea263/35873612626.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gemimagasosazaliw.pdfIn PDF document text
    • http://ave-france.com/pics/files/jutatinafetakesegileb.pdfIn PDF document text
    • https://tsegypt.com/file/ravisupobexusozonufigewi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/kefofukolisodovi.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/lelekuredozivejonekifixux.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gidekodo.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/74218625151.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/wikimapuka.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/42338243282.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/vavutasuzewaketen.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/24342136197.pdfIn PDF document text
    • http://bushurov.ru/images/files/koresixugefapekigu.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/wesodiwiwuketatividofo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16156987569955---morotofuxus.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/80258378057.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kujugokalaralijusaxux.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63097702571.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/xazadidopufozavewoba.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/zolemapexukiwujabetilo.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://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_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 18516 bytes
SHA-256: 29787eca135107990ff16653299eac87b479aafe5e1872523611e9056509f516
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 10888 bytes
SHA-256: 59e6ae748b03a058cea8d212f5fe5b2e32aa9344cc711f2e0a0076ab42e7476a

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