Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa71637e0a3b30ce…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 20:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8900c94874dac9c7ddf2396e6a4d273 SHA-1: 6497063ce5b7861c1c4a11e24e70ad94d814bda9 SHA-256: fa71637e0a3b30ce6aff2279911b8e1c6818a12483df22531ea3ffb9e8e6c373
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content, such as software hacks. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dsacare.com/admin/uploads/file/zuliziwatoxejoba.pdf In PDF document text
    • https://yaslibakicisi.net/userfiles/file/muginunorozi.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/82670715170.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/90648475547.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/94789639690.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/18284696871.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5cbkt93thnad3fdi5h6gb36h82/podagoxosafusimezisagafaf.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/petudijovexolabex.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/lamomudazi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/43b71aa5cdf0af20245640655f76e828/lonofiratemosiwuzupuwowes.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52449388534.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jupilamelam.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/lenizoli.pdfIn PDF document text
    • http://zuszdounky.cz/files/3380514936.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/dofov.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/xuwikazosusosizonenobo.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/lorunugizepanev.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210905050327251.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/85669694886.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/xatejipulepazobogi.pdfIn PDF document text
    • http://coolscape.info/images/files/93686867232.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vaniwenifaranaba.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/22112751554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+pocket+edition+hack+apkPDF 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_off0000b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 10588 bytes
SHA-256: c27408c4fd4e184a7d82a284c2dcf94731ba18bc4bc76d197ee75f10a283572c
font_02_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16540 bytes
SHA-256: 1329e06df5403bce99edf600e369bdee0681a777e2063b403646e2dbe0ab6cc4

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