Malicious PDF — malware analysis report

Static analysis result for SHA-256 da46138bbd679d0b…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 02:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9314923836ec2f2818a516f465eb82a3 SHA-1: b6898e2e8b242a31cc01a2dec39d87e1ef36ba9e SHA-256: da46138bbd679d0bfb0649b1eccf8ee3c62862b515dcf9cba49d4dbac6f6883a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The numerous external URIs suggest a link farm designed to obscure the ultimate destination or distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=mic+settings+android PDF link annotation
    • https://bestcaps99.com/ckfinder/userfiles/files/4674498768.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/3229054768.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/1347745559.pdfIn PDF document text
    • https://toocapen.com/files/zowumovekorifusetiwiz.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fudelanefez.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902233756881375.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/jiwejafesowuja.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/4160630079.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/24651378962.pdfIn PDF document text
    • http://clingac.com/d/files/29329162151.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8173062d7---90131542293.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/xidinife.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/43213171333.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/36381146754.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/72992448945.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614251117a37b---83488050096.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/wisifubaruresobifarexe.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/63129218231.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/74652371011.pdfIn PDF document text
    • http://change4best.ru/upload/file/rozexogadasomibimevixe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/gekadevubonimimum.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/sebokidosokamesumu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/sokigodezetapujijure.pdfIn PDF document text
    • http://jfe.hk/userfiles/barifumozigi.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109230253475349.pdfIn PDF document text
    • http://uniqsofttech.com/userfiles/file///24834122830.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/78208316845.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_off0000b160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 15228 bytes
SHA-256: 626897ea059956f9ce3d2b7a0bdf50c0624eb40fa865d36f9b4ba1e696d8cf4d
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10492 bytes
SHA-256: b8562c059e877f065681d99ec71bc54ac449abf0b5c4929db22ddaff07cbca00