Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdbb0fe3389b862…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 12:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1784ef52375a4aee75b34f78adba0af SHA-1: 66c12176a2b1d3aa2ab1ccf9379947abe247c8c6 SHA-256: 8bdbb0fe3389b86275efc6cc74266b533eaf4242fbc843f42c82f5e66f375ef6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=starting+out+with+java+7th+edition+ebook PDF link annotation
    • http://kooijobs.in/ckfinder/userfiles/files/57090396335.pdfIn PDF document text
    • http://hk-keber.de/images/file/sufofiramutegoxi.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/89712884347.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/89894154787.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/jizakobexaxanuzizubobuw.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/3967151599.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/gijivukadoba.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/30673476367.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/28857178393.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/74752774592.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/83433287784.pdfIn PDF document text
    • http://poliinc.com/upload/files/87979164436.pdfIn PDF document text
    • http://vce34.ru/attachments/file/venuzejodej.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/safatot.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130de3991dcc---47513063121.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a1dc318f---totirux.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/27461158623.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/79995861339.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/puwodigirozejasotunafabep.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/nepolexudowesatude.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631935475b61b41b3c4d8f4c2150f.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210914093740.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/87377299847.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/zuxukubotosewegizele.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_off0000bc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC42 17952 bytes
SHA-256: 9142ed1e1aa6497aed4782bcc8855c7c54708fd42ba23b10bae58185f778a13a
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 11052 bytes
SHA-256: 012e60f583fdc7730a503a152dff6f30817ec5cb0fb0fd8a03171cdbc9685b9b
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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