Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1b82d2ea93c426…

MALICIOUS

PDF

84.6 KB Created: 2021-01-16 07:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f5f036be026bb4a0f58f929fa393830 SHA-1: 569f54d7d6dd87545e95006325f735cfefb03d3d SHA-256: 4a1b82d2ea93c426f3bbe74be2bae8ea56092cc24d6b74d47035415d56dded7c
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 'https://gettraff.ru/123?utm_term=time+of+contempt+book+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within a PDF document strongly suggests a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=time+of+contempt+book+pdf In PDF document text
    • https://site-1242803.mozfiles.com/files/1242803/proform_trainer_7__0_elliptical_machine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbce708ccd8.pdfIn PDF document text
    • https://site-1177298.mozfiles.com/files/1177298/driving_animals_coloring_pages_for_toddlers.pdfIn PDF document text
    • https://site-1176339.mozfiles.com/files/1176339/most_wanted_jailbreak_mod_apk.pdfIn PDF document text
    • https://site-1177693.mozfiles.com/files/1177693/kidebilibemaloroni.pdfIn PDF document text
    • https://site-1172757.mozfiles.com/files/1172757/rope_lights_cut_line.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5fecf7eb9af11.pdfIn PDF document text
    • https://site-1179952.mozfiles.com/files/1179952/free_music_to_your_android_phone.pdfIn PDF document text
    • https://site-1175642.mozfiles.com/files/1175642/antenatal_care_malaysia_guideline.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/dexodekelaseki/football_video_highlights_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/asurion_work_from_home_interview_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/google_number_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/pakekuponufovujux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 4936 bytes
SHA-256: c3f654f222d2bfe9821688a14b6840c91bd2dc6b7375626e289fa4d61b9fe729
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 14316 bytes
SHA-256: 2dc0e5cc0554c996d1e95e05570d84e3c85ac352f6452522cdfc06fa9a40dffb
font_02_sfnt_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 16132 bytes
SHA-256: 43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6

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