Malicious PDF — malware analysis report

Static analysis result for SHA-256 28961a5099e8893d…

MALICIOUS

PDF

75.2 KB Created: 2021-01-20 04:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c1f6b16fc6bb2b3e0a4e194a928168c2 SHA-1: ee9ece3157c6ba58df950ac05f6d26690248260f SHA-256: 28961a5099e8893da3f5e2ea4089e77540844da013fcda3cfe7fd981904e4c77
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to a 'Hiragana reading practice test', likely a lure to encourage clicks on the embedded URL. The primary IOC is the external URI pointing to 'traffking.ru', which is likely a malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=hiragana+reading+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458839/normal_5fade6ccba149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5ff82ba574fc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fde09ab77e07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fe2c303cb1bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_5fa55dcfc1521.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/hgoXYhK/shadow_fight_4_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5f8c7df84517a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_5fd31af13b082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5f934fc1ec35a.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/batiku/sivukudobulibeju.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/latest_christmas_songs_in_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/vibrate_when_call_is_answered_samsung_a20.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/piriformis_muscle_syndrome_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/kiliwok.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/kenazozurokuriveritaf.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/fekipedu.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/misaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/clash_of_the_clans_strategy_guide.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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5168 bytes
SHA-256: 16406c1ee8d80519c622980a0e1304625854b124667500d89f3b3472b65841db
font_01_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 10356 bytes
SHA-256: 6f5b5f07ee580f9131eb12fc01e2802e6c2ccbc25e2671ea0d1e3318a4e9db1c

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