Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dab429298492e3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 23:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2936ceef9e1b512333c21c2bca154dd9 SHA-1: 2a651d0f5da98300de106b95bdfe4136ff1e4887 SHA-256: 86dab429298492e3f8ae79b96d062ff42c86a74b9bb1fe4dc44c65fd1dc525dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a downloader or phishing lure. The PDF structure and embedded links are indicative of a link farm or phishing campaign, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=ftp+player+android PDF link annotation
    • http://sudeoksa.com/userfiles/file/20210908175848.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/tosalemiwowodalavusiwuvug.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/10644627442.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/rutenazekarojugerejuj.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/76495533208.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/kewuzenodawideragekax.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/58037966592.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/11239102963.pdfIn PDF document text
    • http://askaudit.ru/price/kopedireruj.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/18349319943.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/66104958856.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/44425392815.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xelugoselezum.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/94472680653.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/gizitowosu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/ganubalogo.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090407173457.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109180253121328.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/50611046047.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08e43349f---29535855615.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/54034805558.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210921_BE284F336F93B039.pdfIn PDF document text
    • https://ms01bet.net/contents/files/11101082586.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/gadutafoxereti.pdfIn PDF document text
    • https://computerzone.pk/file/gabofuvepul.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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 15584 bytes
SHA-256: f731b42d128f8e3d5fdca07a7a0e87046ab931faad53ed7f0c5168d50a2fe581
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10308 bytes
SHA-256: b797ed54d16dde730ffb02ab7233acc25513fb221223ae5ee1676c21c3a3f863

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