Malicious PDF — malware analysis report

Static analysis result for SHA-256 c167bc85da32ab02…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 16:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d8de37e343c3f4c88d54f2e3e2eccb7 SHA-1: e234df808680f1f0971eab1f970cafe0a55662aa SHA-256: c167bc85da32ab022a987bdfc974fbaa4e6679a14e1a13e3ec4099e6303fa6e3
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, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the PDF is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=emergency+mod+apk PDF link annotation
    • http://trust-law-firm.com/userfiles/file/20210906203458_196230976.pdfIn PDF document text
    • https://digireg.ch/upload/gujivaril.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/digulasorirituxasez.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/lesifavijumunezosewudud.pdfIn PDF document text
    • https://cncunse.com/d/files/42723638108.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/91457691206.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/felobajidetuz.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/bevudatobapufis.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/jivabumufugalo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/33653166381.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/ziferepuju.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26547046641.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/duvijupegoxisenatawefep.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/50476036910.pdfIn PDF document text
    • http://melabo.com/upload/files/vukufusulexigag.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/2282214536.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/riderowowelitin.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/98915820495.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a70437f2---lorugerosuku.pdfIn PDF document text
    • http://snft.ro/media/file/dunesadunufugezerewidupim.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/57564949746.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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10640 bytes
SHA-256: 6e50663c91479bd5cc1f29111d7684b58ef34cd959aec830a3d44927a5de9b49
font_02_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 20636 bytes
SHA-256: 76b23fec3af3da050135f9b6a04a597dd1127e346296fafd1615f03e6549a2e5

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