Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb4115030ba5cb8…

MALICIOUS

PDF

81.7 KB Created: 2021-04-20 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3eb70ae608f1821146261caae59af5b9 SHA-1: daa0cf8cb677ad8f0d173aeb2a6856ad102c1106 SHA-256: adb4115030ba5cb8555f6f5aa4c1aa4fc813997cb06b8bd426ace39901e49340
156 Risk Score

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 0.9996

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://leonvi.ru/strik?utm_term=excel+vba+arraylist+vs+collection PDF link annotation
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/sitenagewal.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/Njfhhtc/kenuw.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/UjdaFhz/80355809960.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/ggjdBHk/funny_wedding_cake_toppers_with_dog.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/7570548.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/hjicsIn/ajax_get_url_from_form.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/Ugiibr6/fox_theatre_showtimes_toronto.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Nii2Nih/best_homemade_hamburger_recipe_with_worcestershire_sauce.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/cEshcgi/23817885062.pdfIn PDF document text
    • http://viwavorikag.22web.org/zafuwarofafaforijo.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ghBggid/ligewokug.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dybjgic/gifidepenozugopogure.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/fifuto/84425561143.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/24904936502.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/77028303402.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/wahl_trimmer_target.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/admob_native_ads_in_listview_android.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/19020661600.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/20969930480.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/mechanical_engineering_jobs_houston_entry-level.pdfIn PDF document text
    • http://zanebinelit.rf.gd/wixowuladupule.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/how_capitalism_underdeveloped_black_america_review.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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 5120 bytes
SHA-256: 151b46dbe3674a170fb43fe0554a952b09c8fa02915e137dd9419a6bc1b251f6
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 11060 bytes
SHA-256: 13a48ab52947b4cb17e8d3c78e6447245e99584ad69fc95b6f31a0965618b768

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