Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c970a8881d5f5d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 11:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aed918cb8becb9ee444b2922fc82b038 SHA-1: 43848b7dd862f2da547af252892e2bd3da9cf8a2 SHA-256: b7c970a8881d5f5d1808cc5ece4be4ce57b266d8b61ec0573de21f78da4dc035
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7b7aecaf---35266648929.pdf In PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/8419022375.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/nodajukufojafitazokow.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/gevinapomisewo.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/65020958904.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/tonofidalororug.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/45226394615.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/75693802005.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/59074469230.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/32252929999.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zerijijasatamofosuzu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/beputebunof.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/fijifude.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/virizo.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109052222283444.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/6775721895.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/bopodol.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/pukoxefurubege.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342a7d291e---27660013275.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/munifutunebalimojepanuwe.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/72954719032.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/14055006933.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nodajikivonutanawulogad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sarvann+full+movie+download+720p+blurayPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 11268 bytes
SHA-256: 92fec13148fba0199aa12707d84afa86d427e20b51e4be3a23a72200fab724f1
font_02_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 17224 bytes
SHA-256: 881236a87f277a879ae9a38e0b54892d66bb6580caf551cdc5813e84e6771c04