Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c58144000ba911…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 11:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 619d625ae24c12f3e757c0972686379d SHA-1: 83889ca5ae68386febdae35496f762dc346012f6 SHA-256: d5c58144000ba911307b8172e7c2973d4cb3502298572ce93b2430c21d5298b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, with many distinct hosts and UTM term redirectors, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pozurevowafufesojadi.pdf In PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59294818566.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/sinew.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090502070189.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/jinuxijopimomefijemupet.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/60176918309.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/wanaridijegok.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/rejusadexutowo.pdfIn PDF document text
    • http://thegioioto.store/upload/files/naribidumemozolimazuda.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/59533095866.pdfIn PDF document text
    • http://upakuika.com/img/file/rigazaparedoluf.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/73311408839.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/bazolonapusogeneg.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/zipuvul.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/62291727517.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109020004417047.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1ac31023---warisavejegezetew.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/67343040368.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/jeguzodukedepanumijasuzi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/3160258632.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xajutexom.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/74002392161.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/famadinilodazimunes.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/zawepurok.pdfIn PDF document text
    • http://billsky.ee/files/file/56953810854.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210906210732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+sims+2+free+download+for+androidPDF 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_off0000c144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 10688 bytes
SHA-256: 09506e7101022d9d03b9a3fc9bfe5ea81d323b72ed67e8132dac74fd2e876579
font_02_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16908 bytes
SHA-256: 71568eea85385cbffcbe65c483ab693b1417454931eeab3f165644ea13b48186