Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb44dc15bd490b7…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 00:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3da62624859aa764aedf98a870aba401 SHA-1: a53920035336f3db45f3c92643e22ed915f2f536 SHA-256: 8cb44dc15bd490b7f2bccd13cb8070ed3df6494dba3082d6eb9dd82dfa04892c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maasmartcity.com/userfiles/file/varuzasibilirukibapenamo.pdf In PDF document text
    • http://ecole.ru/text/images/file/vasapumiromajititubodobu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3a1e0df7---86597846213.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/risiz.pdfIn PDF document text
    • http://duef.ru/public/file/jisasatupiwi.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/lifosekokugafaxe.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/41417876651.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/13551532248.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/vinilojofirosejejal.pdfIn PDF document text
    • http://moneymaker-gold.de/files/38319827758.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/guvikomajami.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/vapevis.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/75495992397.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906161122.pdfIn PDF document text
    • http://orenprom.com/img/account/file/78597355644.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/99923672594.pdfIn PDF document text
    • http://epplast.com/files/file/vofejipofidekoxizabegut.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7i413tkerck2o89451vhejehab/rorefapojun.pdfIn PDF document text
    • http://besteva.com/upload/files/sitedutidijezizadokora.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/xoxisut.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091603225797.pdfIn PDF document text
    • https://digireg.dk/upload/11132901247.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/49196186585.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/7647706587.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gajalevoneri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+fire+update+version+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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 10680 bytes
SHA-256: 2c443fecb4f15f9a708b2a40caf07cd00b707e4dcaaeb5691bfe4918e8a3b357
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 19176 bytes
SHA-256: 61fc1e93cc0bbf4b9c84dac7d844bdd9f820a946037594796e2a86336212a710