Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4145996bde0a1f8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 04:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f06faaf739f96e6c9a22e78c11532b93 SHA-1: 0b2dc02ef0f2b614bfac2f57274909f4e8ce6e3e SHA-256: f4145996bde0a1f82e30b0c0431a8f9aafffc1191deea47bea6a1ccaccf0620f
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 pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with malware distribution, likely involving a phishing attempt via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=grim+fandango+para+android PDF link annotation
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/30568418228.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rotoxadepegirek.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/52fbc1ad0457536b9d2028e58d0cfb77/tezogurimileronu.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/rizufugubukufiwit.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/tuwutizawodotepepefebifa.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/kexegijopujapik.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/73506299834.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/8809451967.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/84501704335.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/fageva.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/79643915576.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/38424302730.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/betopogurapikexa.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/16082741259.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/64547229192.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/tevitisuvolabes.pdfIn PDF document text
    • http://asfalon.com/__files/file/99050766075.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/86118660042.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/jiribofesujinugunimemipi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/60615495388.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed3ec964b---deposuvojutanuli.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/garixe.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/97723034320.pdfIn PDF document text
    • http://neteyes.eu/editor_up/52269263237.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_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 10436 bytes
SHA-256: 4c7c37cdf475baa54b529a83d99d09d2be9d2a8980992a7c1c2c040ff9011848
font_02_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 19168 bytes
SHA-256: 7cf1e056ec716f29c05c2e4d2458eb8a7465caefaeaacb30d214a38856d8c2cb

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