Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f3a87ef80a1cdb…

MALICIOUS

PDF

77.4 KB Created: 2021-03-11 23:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7bc2a3a32e215f4e219ef58cffbe9c8e SHA-1: 2996824f45d3f81ff14ed3c45428088a4e82c81f SHA-256: f3f3a87ef80a1cdb8694e778f5f137922c8c43eaadb2a322ae84cc7fe12a9aaa
134 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The document body, though heavily obfuscated, contains keywords related to 'Kumon answers', suggesting a lure to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=kumon+answers+level+d PDF link annotation
    • http://latencfsrt.space/nagususumadadedupqg43x.pdfIn PDF document text
    • http://llloooodddd.space/brick_breaker_star_unlimited_money_apkgh2o4.pdfIn PDF document text
    • http://leadtop.co/flannelette_sheets_ebayn1cig.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuvimavofo/9igjnif/6090640275.pdfIn PDF document text
    • http://kupivse.xyz/xanifokibenitezikisijby642.pdfIn PDF document text
    • http://homebig.space/tadap_tadap_ke_mp3_song_downloadg2up1.pdfIn PDF document text
    • http://item-get.top/sazuvalezowck4c.pdfIn PDF document text
    • http://cabinetsop.xyz/8589286373qua83.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/iwXa1hg/63284997696.pdfIn PDF document text
    • http://biggymstoe.com/45493412978ko7kv.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/iefGjgt/wusixuran.pdfIn PDF document text
    • http://golden-charm.ru/philosophy_the_power_of_ideas_9th_editionvqr27.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/429418281935ejeq.pdfIn PDF document text
    • http://evakuator-uga.ru/74730977891cs7xk.pdfIn PDF document text
    • http://zzzmmmmejjj.space/defense_zone_2_hd_lite_apkqqush.pdfIn PDF document text
    • http://arthromedro.xyz/ruger_p95_slide_removalr8m9w.pdfIn PDF document text
    • http://eushopvmn.site/credit_rating_report_ireland98um3.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/suxuzubojut/what_is_half_life_in_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/53029900277.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/s._s._c_marksheet_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/fepanakunizitotezosid.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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 5092 bytes
SHA-256: 7fa0c2c7e485cb7d37bea697c92f6307233e7c6fe8b203e12e55dbab31f165cd
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 13108 bytes
SHA-256: 8af9786315e820c65405350cdb9e8b1014494ef0f7f7d8d61ee6011cc6b726db

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