Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b9a0bd45e18116…

MALICIOUS

PDF

68.7 KB Created: 2021-02-16 05:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a3f6d364983a28d92895045f2bee83d SHA-1: 706dba4450d54aeb29072d42db475931a82c8b35 SHA-256: 35b9a0bd45e181169aadee1beed013bd474d1a0f08b5618f36e94043011eab64
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although the document body is heavily obfuscated, the presence of a malicious URL is a high-confidence indicator of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=sociological+imagination+chapter+7+summary
    • https://cdn.sqhk.co/kufalavoxig/sgd0omW/zolesalekivagajipimawugug.pdf
    • https://cdn.sqhk.co/felebamifuk/fpijhaa/crazy_swing_vr_mod_apk.pdf
    • https://cdn.sqhk.co/pidefatop/ijjgi0i/jusulinipiwogelakegodi.pdf
    • https://cdn.sqhk.co/numovasovev/ierknsF/guide_for_stick_war_legacy_apk_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wumodukubaru/cds_2_form_date_2019.pdf
    • https://s3.amazonaws.com/wixatax/xemizelir.pdf
    • http://nufejubonuviwo.epizy.com/20417463959.pdf
    • https://s3.amazonaws.com/tawovojo/nalipujeposowixis.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/39678252983.pdf
    • http://viduzakovovamu.rf.gd/garen_guide_league_of_legends.pdf
    • https://s3.amazonaws.com/gixawetopoli/bioinformatics_companies_in_india.pdf
    • https://s3.amazonaws.com/jadere/47574293255.pdf
    • http://visuvowimew.epizy.com/kyoto_japan_tour_guide.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/fozekimubipisusanizig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fd.bin
4d74f9fcb2fb9b2cdbe56ab3abc1937490cc81c9542d657b0869fd56acfe449b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 5632 bytes
font_01_sfnt_off0000e409.bin
04315088cc47fbd9326438dde72f8adc75ac47ce1263cf018b5d29cb3f70a26e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 10184 bytes

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