Malicious PDF — malware analysis report

Static analysis result for SHA-256 36683d3b0507a7cf…

MALICIOUS

PDF

77.2 KB Created: 2020-11-29 18:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 851081b2904e9d9b3ae0235d6533ec12 SHA-1: 197c9b06f68f4a137cc28adb47198afea9a9014f SHA-256: 36683d3b0507a7cf2f04630098edab93cf9258b47c5f4891fcf657a4d21b3506
154 Risk Score

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 'gettraff.ru'. This indicates an attempt to lead the user to a malicious site, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/123?utm_term=quartic+function+calculator+from+table In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xifabilejilab/download_adobe_premiere_pro_free_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/99166649825.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/xojilipofe.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/zojezegomusepima.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/cat_background_pictures_for_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/vufonegugosiju.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/jowepim.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/ann_arbor_circus.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/assassin_value_list_2109.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/assassin_s_creed_origins_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599188e5-72c8-4c9b-9b41-f32f29233180/teliwomifujewalojul.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/hack_android_using_kali_linux_without_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/hpi_baja_5b_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/critical_ops_free_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b668e9c1-9427-4b94-a59c-41f1e76aff4c/lankaenews_sinhala_font.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 4932 bytes
SHA-256: 3e995bc1556618f9368a3cc71eed627c0508f1ba8247513d828f1f65a855ad4a
font_01_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 11700 bytes
SHA-256: 30da838b114feb6ad44897091de7ee5eb920a27f77d96b4e4664e32452dc6349
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16108 bytes
SHA-256: c63d44e06cda4317aa3f6a42e86e11441ac2f837a1854d990fd83bc99b838561
font_03_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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