Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf90ce2ed4c2c2a…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 12:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 884eaafc3da6580beaf32eb9ff39d711 SHA-1: 6e1e8a1ca6f3366866c44457b993903297a2d686 SHA-256: 2cf90ce2ed4c2c2aa86a87f38a7bb71e79d3aaa8fd7f3e489dc503ee807a12d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=how+do+you+make+a+crochet+circle+into+a+square PDF link annotation
    • https://sitekitenuzuvi.weebly.com/uploads/1/3/2/3/132303150/8887222.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/fKahfjc/rupedebek.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/x0iggfb/color_chicken_switch_3d_model.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_602cddff6b1f1.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/motuzobuvewariw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_6032a357a8e32.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/hX7MExT/alarm_clock_radio_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/lazaxosu/6wHLu7I/oklahoma_state_football_schedule_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/KWBgf83/oreo_cake_easy_recipe_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/eeZgfhf/riteloxazerobeb.pdfIn PDF document text
    • https://cdn.sqhk.co/kopozufu/QifYbQ0/orbit_spinning_mill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_601997f00de14.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/Pcibjj0/30449638572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_6030df3c7e1da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawozunilutufu.rf.gd/48459946575.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/mabegosekikuli.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/selodaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/december_1963_sheet_music_piano.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 5524 bytes
SHA-256: a9f60830c017e37cc65ad66985248efb804af3a9c0f8b0f7844cb4eb7bbf198d
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10656 bytes
SHA-256: a42395829913a1d3adaa40e18d4c30b828dbf617d76518b47f4d9497c126f412

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