Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f88494614ace6a…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 13:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 33bd4863edca8ec8ccd0a01ab53b8841 SHA-1: ba71fcf2618e16df1bd19f1d9e386ec0755fe91d SHA-256: 26f88494614ace6a99c1bc04b916354476778f3cb1901f9077552b731b3abc5e
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 are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. The document body, though heavily obfuscated, suggests a lure related to 'chapter 9 chemical quantities learning review answers', likely to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=chapter+9+chemical+quantities+learning+review+answers PDF link annotation
    • http://cetop.xyz/biologia_ceneval_exani_iizk0gd.pdfIn PDF document text
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/wadirokuxidetix.pdfIn PDF document text
    • http://eurosett.net/antrenmanlarla_matematik_2_zmcdy5r.pdfIn PDF document text
    • http://nncucuucuc.space/opel_cascada_preislistet7drs.pdfIn PDF document text
    • http://bitsracing.net/30318392851eq896.pdfIn PDF document text
    • http://italiahot.fun/757267864025st0k.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/ups_waybill_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/arcsoft_totalmedia_3._5_serial_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/lalowiladu.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/xetitinomifaxorolog.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/advanced_java_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/xiwomuxamud.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/nexilalerijez.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/dispute_credit_report_experian_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/space_engineers_blueprints_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/92430320208.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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 1684 bytes
SHA-256: c47328b99d1a8106722297ddf3976446a0c29354b3be907203f77db8ad888c37
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5688 bytes
SHA-256: 8ad53a54a418b914f1d63d4e1b367e61b155a629237765ca99ed2d0075455a9c
font_02_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 10368 bytes
SHA-256: 4fa6232c016f9a0d04092b1316ec511bdc4108675e0c9b232c0d31c081bc5d2e

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