Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a92719674bd083…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97b9928d18df54b5eab426796b8877ab SHA-1: a21fe4c6368aacd628846ef7c17e105735f4e3d0 SHA-256: b9a92719674bd08369539bf1f69a3c5d2678a387ca43c0205188197ce9557ea9
126 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9igosh0l1m8giesg4sh8ib7sc0/gadawapulexofadilavija.pdf In PDF document text
    • https://hijaustabilo.com/contents/files/53985103099.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/gifefajexofofiv.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fawebewatifi.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/lusufatoxefifige.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/75170075495.pdfIn PDF document text
    • http://elitk.ru/_files/65777552048.pdfIn PDF document text
    • http://elsped.hu/files/file/nuworanuno.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210928040003.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/78841749392.pdfIn PDF document text
    • http://pb-book.com/user_file/file/8039262157.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/43479532762.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/39438160063.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632527768.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/tatugoveluregorojokir.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/xoxapogixufixuwipiz.pdfIn PDF document text
    • http://skncn.com/u/files/vukol.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bikusu.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/kulofukemel.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/jisazamepofavupodakidub.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wizebonebakobi.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/1139788664.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/82621185956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=crash+of+cars+hackedPDF 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_off0000b2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 10356 bytes
SHA-256: 0f891c4de952fea66e3a20814e884aec66e05f80b1228e859844a17f81111296
font_01_sfnt_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 17512 bytes
SHA-256: 6ef22ca600be8c1074977efff802d5d56cfb450a2a39739b1c461bc397dbb8e2
font_02_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1