Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5c1ba6e99699fa…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 13:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38afda148167360d242b2b78ebe7d82e SHA-1: 8bc9cb077076ff6922b2fb173015f472e619327a SHA-256: cb5c1ba6e99699fae1bcde4b6667feed85c80ab40031615c783f8663796f6684
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=cops+and+robbers+minecraft+seed PDF link annotation
    • http://urotunisia.com/uploads/FCK_files/file/gikobev.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/budixinud.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/ruzalovori.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/rotilorupexepageraxukeze.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/96718061093.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/lexesegiporibivok.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b116abaf15---xozekurodedokabusin.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kosobaladaladi.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22933784871.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/motibosegivimamusijosama.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/63177303368.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/41781861793.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/kepibozopevaw.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/045912_bebosaminemedomugog.pdfIn PDF document text
    • https://phukienbep.net/media/files/lujirizananagaguziziso.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/kezadoti.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/48460149747.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/jebogatumema.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/14526564150.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/79067579216.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210907233026.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/mexowidezipovojabunonej.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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10904 bytes
SHA-256: ccf79a2103a13dcb415407336096a86e722423b2d7a881f05d45af5e965e51e7
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 18396 bytes
SHA-256: 42e21d6f22d29b1fb496b1caea7f6370a7a18e7d8dd11a3c5761e6d13e487e2e

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