Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcb014e9a2fca07…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 16:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 926372a3ca8d8ee99da570563a11b4a0 SHA-1: 602d4d6b2359c07cdea1822cf95bb64a8080c780 SHA-256: 7dcb014e9a2fca07e8a0b667554ed24d9a6682e87e086d33dff101522b9a40e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including one identified as a link farm, suggesting an attempt to direct users to malicious or deceptive websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://resalured.ru/award?keyword=saturated+steam+and+superheated+steam+pdf
    • https://cdn.sqhk.co/mewedenemez/blicgex/xulumoxojetanixa.pdf
    • https://cdn-cms.f-static.net/uploads/4500670/normal_602cdc6ae4cbd.pdf
    • https://cdn.sqhk.co/pulovafafita/g1hahji/gravity_dam_pictures.pdf
    • https://cdn.sqhk.co/sotatixorawi/hc26AeI/sticker_studio_wastickerapps._com.pdf
    • https://cdn-cms.f-static.net/uploads/4492259/normal_6041d3dfb9a54.pdf
    • https://cdn.sqhk.co/jovakuki/jClcjbX/tujob.pdf
    • https://cdn.sqhk.co/feguzuvubut/xjcZjgK/96751528522.pdf
    • https://cdn.sqhk.co/dodiniwotud/ggibPD9/54832163746.pdf
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fc687e67be3b.pdf
    • https://cdn.sqhk.co/xibetevoxaj/eage2pD/judisaxokexawose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_dbc0cd2d9d914e80a6dada85d5e651bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac491854-ac98-4e52-8da5-91576a83cd86/26679318033.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_1275a64e97c643309f89150ea116864a.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_699d2ca9bced4a05a62eab7ddb67d2ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a1d853e-3659-4891-805e-0854e6e3e2bf/12210395168.pdf
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_f12b2d52cdaa4f6a8770d7168ecd169b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99df26f9-571f-40b1-8d0f-342ad924aab2/noxerexosojidepif.pdf
    • https://uploads.strikinglycdn.com/files/dca35259-8aaa-41bc-b092-0004ea1ac26e/ibn_arabi_unity_of_being.pdf
    • https://uploads.strikinglycdn.com/files/8deb9062-5e16-45c7-b2c5-9c6c87521830/sunumumujukagog.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_3236dce5c2c34ca58acf1abd5b4e97e4.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin
782db50a1f847501fc5d40dd050d0f5832cd1ff1eec39f9ddc7affe8ed8b3dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5352 bytes
font_01_sfnt_off000102ce.bin
6fa78332f42555645b504e39ee9e3e712cb18ac95a37ebdd5d2bb7871f18a9b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 15164 bytes

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