Malicious PDF — malware analysis report

Static analysis result for SHA-256 a269ba16e0dcc838…

MALICIOUS

PDF

75.0 KB Created: 2021-02-20 04:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 73b1785dd1c652cec4b3f00b2223b92b SHA-1: dcd62f6d9764c04736bdc1f87a0744378891581c SHA-256: a269ba16e0dcc838d2810613fb7dadf3d9feb1ecd3a3be6efa10886046b34805
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with one prominent example being https://jacksth.ru/strik?utm_term=english+course+for+adults+pdf. This indicates a phishing or malware distribution attempt, likely using the document as a lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=english+course+for+adults+pdf PDF link annotation
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/xawixidefeko.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jikhjhc/32700228383.pdfIn PDF document text
    • http://accueilcmb.com/how_to_pair_dish_joey_remote_to_tvtwdql.pdfIn PDF document text
    • http://republvinb.fun/38265676100zv9u8.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/Xhjijt2/bmw_car_wallpaper_hd_4k.pdfIn PDF document text
    • http://kzrovk.xyz/79113457610zq6rb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486034/normal_600c6948dfb1d.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ihWhhgJ/15978994758.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/837685097656k17z.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/jigubadeluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_6019761d0504a.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/jdYighj/lewinetekizevofixafoxoko.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/kipevezenab_nujog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vunizi/anticipatory_bail_affidavit_format.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fancy_ampersand_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/basin_street_blues.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/94958082098.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/mezazoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/cbse_improvement_exam_2018_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/sejidiniditi.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/55347563870.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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 5376 bytes
SHA-256: dfcb752c6c5f89860be80b97e0763d04c73524f16d52cfce5978009e17f53b54
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 11020 bytes
SHA-256: 375cb6e0419287713ea8f2556823984759a4c27e0da3f4903d8a59f6a81fa788

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