Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3aaaae60ebe01a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 03:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77275e1a5fe3283d973a67282202c511 SHA-1: ca5adf809b92428fc37aec89cc33028465c557c1 SHA-256: fd3aaaae60ebe01a6104a5a958e8f0780a41e8848fdf83bc15b9bbe01003da76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that redirects to a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://irlanc.ru/uplcv?utm_term=gangstar+vegas+open+world+games+android PDF link annotation
    • http://dar-tom.pl/userfiles/file/26851524863.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/15907959067.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/vonujixawenaji.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/sebedodosejanora.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/zizuvaru.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/firoxupiwur.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/kukatabigazozo.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/93532077066.pdfIn PDF document text
    • http://teakdeck.pl/files/file/pawozalalo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///50649577386.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4130aa59---fujosijogufir.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/jiruzejojavumefovexomew.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/79191496387.pdfIn PDF document text
    • http://yibetter.com/data/files/mogojulijusitiraribe.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/wowalivubulada.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/70149309019.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/negodajijod.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/parowawovobetigobuj.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/63538023492.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/faxujewurog.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/rokaberedepeva.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/vejeperawugodepumojega.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/bebudabub.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/33451073738.pdfIn PDF document text
    • http://shatalarab-llc.net/userfiles/files/xitulojofozetakij.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/xitudodebaweratevol.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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10928 bytes
SHA-256: 2c9be47d4546356e72a4c2fd1a486dc748eee3307de9cddcb3c0d0388403803f
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 17684 bytes
SHA-256: 8c87f45ffe2a7fd2cc163ece7cf502f395a9865e5a5a2cdbc5f20121b4cd527b

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