Malicious PDF — malware analysis report

Static analysis result for SHA-256 034a9ca794de249e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 16:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6704dca3f8b7ce81a80611fce8d333c6 SHA-1: b2b630e3a8a64890a3f118dc6b349b4bbbd5de1c SHA-256: 034a9ca794de249e6878156f4482bddea9ddb07a112e0ebbc628657be6cc74b5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where a password is provided to decrypt a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nusbetaja2.com/contents/files/vigedufip.pdf In PDF document text
    • https://gornjastubica.hr/files/wodovazezoroditegeren.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/85301250151.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/5737591783.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/20852943388.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/70035524964.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/16593136910.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/75446730409.pdfIn PDF document text
    • http://centromp.it/userfiles/files/fatepuderive.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kabadorusisejukizurape.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/47956166105.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/fosutabolagepane.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/24798357824.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/perepiletijubebetuker.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/gatolodamebawuxaxuv.pdfIn PDF document text
    • http://bptramptour.pl/files/file/89125162986.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/43467725386.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/83035018923.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/wapupiwuve.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/mebiwoporiladofewiso.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jozip.pdfIn PDF document text
    • https://clinicscrm.com/img/files/piramufupabesumoju.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/nedinolopizasuxoregatedis.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/37674054870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+9+latest+updatePDF 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_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 17928 bytes
SHA-256: 7c2ee440c3f1b7402d5a6443eb33f2a212eec55f3cc4cb27af5e4cac54dacb0f
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 10636 bytes
SHA-256: 2f4c664a6a3af0f6c43d894215d1fe5a4eb76f945e23023cb67a3342145535e5

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