Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9790ab68e333530…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 06:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 211cd29b281b27418167f7ce6cfc6133 SHA-1: b522036baed42b53a1bc74bf7325460368757c92 SHA-256: a9790ab68e333530e4be15f047e7d0e7dc5a64f989ef5437dfdc740b1283f53f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous links pointing to various domains, some of which are disposable, suggesting a phishing or malware distribution attempt. The embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading potentially unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://studiotecnicolamanna.com/userfiles/files/43628056381.pdf In PDF document text
    • http://www.childofafrica.org/media/userfiles/file/kapalaku.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd29386e5---fezonafov.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wirowokisiper.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/60816071044.pdfIn PDF document text
    • http://kme-kme.cz/files/file/wanijerawebufe.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/talumez.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/xozidegogujunuda.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/mawepirenufuvese.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0f532581---56121811126.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/kemunuzakuzepobazowovejij.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vilitisamazisukek.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/68407285116.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/8682456922.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78687440783.pdfIn PDF document text
    • http://stroi-sistema.ru/img/95725735248.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/kemurajefik.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/35025080275.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/14678009285.pdfIn PDF document text
    • https://ms01bet.net/contents/files/91737269618.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109032155231767.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/fokegodotebekivoxuzudebop.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/15175187034.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/15401369338.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/jabokutowuwosugifiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+fire+red+hack+download+for+androidPDF 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_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 10652 bytes
SHA-256: 8a1e85f3eac025e4699b0799290f69800ac276d28fac6905440b83f9d661b9b8
font_01_sfnt_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 17892 bytes
SHA-256: 0ea2874626c2337b38a258737b9104d5eddb0ba8a5399911b4b2e095b55512ab
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1