Malicious PDF — malware analysis report

Static analysis result for SHA-256 c621527ba3675d83…

MALICIOUS

PDF

68.1 KB Created: 2021-01-04 23:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d1a729869f2c52d3d25788edca7ef1c8 SHA-1: 89e1b28908f9bdf42c31e6bde68a4283b904eaeb SHA-256: c621527ba3675d839eda6018349da488ecd06b507eab25c1f3f690e1190179d1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/123?utm_term=wow+healing+addons'. Additionally, a machine learning classifier and ClamAV both flagged the file as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of embedded URLs further supports the phishing or malware distribution intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/123?utm_term=wow+healing+addons In PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/kazugosisabeg.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/dCigyxi/jijepaji.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/Aihhage/best_paris_travel_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/ScUmMGm/totona.pdfIn PDF document text
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/af579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f87f15b5d832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5fcae75482cec.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/subud/tebidasa.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/background-_size_cover_not_working_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/chilipiga_chusthavala_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/23596460656.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/english_word_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/therapy_goal_setting_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nudiforudonos.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 5096 bytes
SHA-256: 0b89f9c37387b70bda47b4f1f0938b6f6e9c1489c16b3ec2755b518315b55061
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10832 bytes
SHA-256: 873b561c2f479fc3fa0d0c55a42bef6dea6646837be1185e32bd9923f0e810c7

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