Malicious PDF — malware analysis report

Static analysis result for SHA-256 7756c3c64c92d7f2…

MALICIOUS

PDF

73.6 KB Created: 2021-09-28 05:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77d0998031eab57e52f1001648938ee0 SHA-1: 27cc86c681aa65db2d6c6fd3292a21f1142c0a7c SHA-256: 7756c3c64c92d7f2d54f56570e17e6c16134b76349b23aa00fcf4eb36eabe5d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The PDF structure and embedded links are characteristic of a link farm used to obscure the final destination, likely a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=reingenieria+michael+hammer+y+james+champy+pdf PDF link annotation
    • https://cleanenergy.mn/uploads/files/31866181828.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/31695238630.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/89231449526.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/xukenulovudeledem.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/35974285180.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/55850205948.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/3408302100.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/kinad.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/fukesizojolalumuvunamu.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawajetudekadelidaronuto.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/rorugolujudevi.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/genigipirapa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17fc7c9a---jopogimijazudasosomo.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/duxij.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/pageberovuto.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fizifavo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/5128035341.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-19/20210919155649843375.pdfIn PDF document text
    • https://clubon.top/uploads/files/48741804195.pdfIn PDF document text
    • http://hocomesun.com/upload/vitotap.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/79922297157.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/zufowifewirimivorasowes.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f545e17f83---11497356926.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/disuliginenufevis.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_off0000ba40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 11136 bytes
SHA-256: a43bc5dc2956fd97aaeb71f5f3a399ec92d0c2132fca873bfcac81ac3e19d3c6
font_02_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 17372 bytes
SHA-256: d7bb0d04a5966956dd43c31f9fe533ed92b4b9f96598fe499db2adafff31e21e