Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b5a1d8b2bd65bf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 08:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d865310b7ed0302eb7b74d190f442ba SHA-1: a8e942723482321091389d9f1d6260f2fe350b72 SHA-256: d1b5a1d8b2bd65bf9e9459a627290b1d06e09d0d0cbebfdbbe68e9edf1f0938a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=jungle+cruise+2020+full+movie PDF link annotation
    • https://marwaservicecenter.com/nbloom/fckuploads/file/36250990177.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/44825354215.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/pofanitamake.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/94316860099.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/vebefusidepolupesofe.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/88536144115.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631369284546488389.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vixowomilofivuwinenufude.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/3105072439.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/zulosukexozawonisovum.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wewenitopisaka.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/niroribuvogarurex.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/bapudikurojupobu.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/wafegipe.pdfIn PDF document text
    • https://advik.net/userfiles/file/11692781075.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///13342810727.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/gijogorezitupil.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/kamobulamegoxus.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/pebabidigaxaluketov.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/81540390182.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pesekafiluras.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/30808375521.pdfIn PDF document text
    • http://siemreaptraveltours.com/userfiles/file/filulefe.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060555024502.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lamafidovelowexilexobasa.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/58015156624.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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 17904 bytes
SHA-256: 35aa4fc5747744d0fb7a2364184c394c210d49734861a4485c0e1f4adb904430
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 10820 bytes
SHA-256: 75a24276ed2d0042e15d826593655290b2e1ffdc4478eea97197da4c9a5a5c43