Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8821a34378f7ea4…

MALICIOUS

PDF

90.0 KB Created: 2021-09-13 13:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: caff7ca3527eaea0549f311aa278124e SHA-1: dd7968c2d982bc753d8904df38df4e3e9d06122d SHA-256: c8821a34378f7ea455c36157c8f3912d292a8711e93cd4e8300ddb746c7578a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with specific detection as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://gaineyranchaz.com/userimages/fenapezesenakizipej.pdf In PDF document text
    • http://fluorescent-training.com/file/benurujozag.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rumoxesuluza.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_BCCFC730172452C6.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210913074759.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210901081757803.pdfIn PDF document text
    • https://ivanamihic.com/files/tekuvoxufu.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/9121306923.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/bulesujawelov.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vekuwum.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/maluk.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93655343634.pdfIn PDF document text
    • http://pjteam.hu/uploads/sunadusexoguz.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/xaludusewumabutemidas.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/lifuninaxobotikukirew.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/23369467151.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/60030283262.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/vilezisubisiweranekexa.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/56808072760.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/63081128750.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/nemorafepuniwutumumelafow.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/lukakajowet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wish+you+moviePDF 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_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 17228 bytes
SHA-256: 7f66aee2192869f8e1821c7067858a1bd3930ba3ad0ba8f6ee79d09585a53e50
font_01_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A0 10136 bytes
SHA-256: a170232e0613f97f1cc68b2cfef900698e5d82d34f02249ffa221c4492ab39a3

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