Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c2df215ec768fd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 12:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3816915a3cba259f0d0f11ccbd38f149 SHA-1: b3af203b25296e12f4a8de46310392b9ff1f438e SHA-256: d8c2df215ec768fd8fba50234d0f797fcc149d80f949091311d146b433520dc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and embedded URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://stoewebdesign.no/userfiles/file/kupagubo.pdf In PDF document text
    • https://mihalex.by/files/files/46896417722.pdfIn PDF document text
    • http://nature-revive.org/files/file/10396719662.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/70291420741.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631510833.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/voxabajopawuvujakosu.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/fajiwapuwuwomasejakejof.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/13534478972.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/roviwenazubobafo.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/11984307380.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bagag.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/86167534822.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/79680990672.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/datapefituzajiraka.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/94454654282.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/mokesaga.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/34421370845.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/19094907445.pdfIn PDF document text
    • https://norservis.com/files/files/pasabajeraba.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/ralojuwevirozomo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fca3483bf---6683437037.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/74172532965.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/00bb908e442d318adff953ecec6c411c/56924629798.pdfIn PDF document text
    • http://waypl.pl/upload/File/19083136858.pdfIn PDF document text
    • http://cartopack.be/Images/file/50825274082.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/lolef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+war+dragons+mod+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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 10592 bytes
SHA-256: 46010f6c37322f1cab6127b47601208eea895e41ea7c18b8a9f2366f9d776c31
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 17440 bytes
SHA-256: 843ed65972cc6075702c5db92f019f279d17c2616d9d3b531efe78f9b7b8430d
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1