Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e3511d8edc8328…

MALICIOUS

PDF

77.4 KB Created: 2021-02-11 20:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46a1b90bbff0e0fed6e3654723606272 SHA-1: 032deabae01274e6ea14019dba8586aee06e0e7a SHA-256: a0e3511d8edc83285c3ab0c8a8d6be14a32d8a414a98f95c22dad4beb78613c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://crophysi.ru/wix?keyword=universal+studios+interview+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/pibilebomek/hdxjdxY/thinking_skills_assessment_test_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6021d32968fbd.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/hcdOVCd/the_room_movie_2003_online.pdfIn PDF document text
    • https://sitadubudotewor.weebly.com/uploads/1/3/5/3/135335426/5c7903c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fe69b45529d7.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/hevjjih/play_store_app_install.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/agdvWhi/83789030204.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/5a88775b6.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/6349367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_60218edc8842c.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/wemobowoji-vabur-roraruwivev.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/r9wvgcm/16151949385.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_60030940b028f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 4968 bytes
SHA-256: 6edc63b69071ad9518295c64df73845297d92df2b5840a5b5fde6c4606378135
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 10088 bytes
SHA-256: ebb1d50709e6704aebbbc62f8b5b0f122e535a25e018975dd5da78e6070689d9
font_02_sfnt_off00011a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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