Malicious PDF — malware analysis report

Static analysis result for SHA-256 df21fdc8df5988fb…

MALICIOUS

PDF

75.5 KB Created: 2021-02-27 15:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3e508ad3bdd2ea29c782ff2bb5522bb1 SHA-1: 00ae7358608a29ff7f69e4b9613853d3d99fbcf4 SHA-256: df21fdc8df5988fbe7e95dc81daae57aee1864335f3180cf5dace3c0bc98a6e9
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful sites. The presence of a 'ML_NYX_PDF_MALICIOUS' flag and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=vegan+gluten+free+lunches+for+work PDF link annotation
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/lometofeginafuxiniwe.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/PiiG5jb/485116466.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/shgndcV/jalekazonimurilopitil.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/iVidkGl/suxelazumunapegex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_60081e11df7f9.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/jfCn4wK/ravensburger_puzzles_online_uk.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
    • https://s3.amazonaws.com/jijumupade/abkhazia_tourism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/behringer_x32_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/dojisogex.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/32115782011.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/appsflyer_sdk_integration_test_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/wutatadafezunubozomuziri.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/grecian_urn_template.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 5100 bytes
SHA-256: bbba99cc8df055fefba0ddcb8b47177a7ca01d2acec53fd526ac0ae1e6d26bda
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 11004 bytes
SHA-256: bef492646fe7f990a19086db8adeab7b940963a40a0c18d7613e76aca4efa459
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.