Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86277a011679170…

MALICIOUS

PDF

69.4 KB Created: 2021-09-21 05:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b1c66e9f6039befdc9f3224812d7ce0 SHA-1: 745e01adc2fa828d91a357f4fb60bf4cd0909e99 SHA-256: d86277a011679170a9f3f50acd985a9f1ee239f1b8de3151838dff6fa654a349
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or redirection campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or exploitation, hence T1059.007 is included.

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://medvor.ru/uplcv?utm_term=arabic+verbal+nouns+pdf PDF link annotation
    • http://dungcubepgiangtrinh.com/webroot/img/files/68136961447.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jubofawulorub.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/66085390450.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/34438160654.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630997761.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/dutagipusemisosoxamif.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kigitilikedoresus.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/wupikupu.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/26832142091.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jixugisidexazuxejudilir.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090811491273499.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/11395977939.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210919144955.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gegolafanutakelibeximalo.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/birazafedanidare.pdfIn PDF document text
    • http://baove24h.info/upload/files/kogapifomo.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/53023745606.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/45933877347.pdfIn PDF document text
    • http://riversedgefm.com/files/file/mojonewesejoralad.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/porage.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/12141892614.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/53995448002.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fudalejugomusimofire.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd6ba6f2d---xodijo.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_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 15824 bytes
SHA-256: f1df9880565a25c940576543de5b302ed2a50fa123aedb66c3ee28aecb0bf635
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 10804 bytes
SHA-256: d4a324f97a6b1f040a0fe889d12f604381f31a4df80e5fd5a07acc6174be7932

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