Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8dc005a71a57ff…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 21:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 321fbd155999c712f275bd1724ac5299 SHA-1: 73817e967bab4fe50e52505e4dc09dceb9f60acb SHA-256: ad8dc005a71a57ff65bc56db6be3a7d67be01c0f7fdf4b75dfb884ea00ec3856
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URIs point towards an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://garglob.ru/uplcv?utm_term=how+to+make+phone+as+a+webcam PDF link annotation
    • http://studiophotosfashion.it/userfiles/files/80725134229.pdfIn PDF document text
    • https://tch.lu/files/files/xitavadagonineg.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/diris.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/4391190261.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/wumoligakezovo.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/JBSVds4anrf5.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/43629718390.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/jexikexe.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/1919109226.pdfIn PDF document text
    • http://midel.me/userfiles/file/nukigevavixakitawudizegaz.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/vanoba.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109010626262801.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/femuxaxokuku.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wurijanixiwepimesikan.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gowitarulodifujak.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/14376870669.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zebowejurasibanuxa.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/22882303686.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/mofiwumoxofo.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/33446256758.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/tedofu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05ee7aeac---sopamemejivubepo.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tivopaz.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 19192 bytes
SHA-256: 6166dfb9cd741691497b2c8162703e910cdb944c96352ee9892158b64303b5a5
font_01_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 10712 bytes
SHA-256: e1b7eb80472ab696ae507029d2ded9014dab6167480d30f10a4bfb67aec54d28

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