Malicious PDF — malware analysis report

Static analysis result for SHA-256 351bfdbc547a75f3…

MALICIOUS

PDF

70.0 KB Created: 2021-02-04 22:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 972c5713e527e515a271376b2dc7ebf4 SHA-1: ab2de9688251aa2b76d077d6730625ec3c3c806c SHA-256: 351bfdbc547a75f39196819be04ee42d9cf7d9cb5a36222dd06970e4a39344dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wb?keyword=wow%20classic%20%20slow In PDF document text
    • https://cdn.sqhk.co/kizusuvut/7Ouhaie/86535540753.pdfIn PDF document text
    • http://popapirim.22web.org/viluzulomuwebonanogone.pdfIn PDF document text
    • http://gesizuwumog.iblogger.org/celluloid_guitar_pick_sheets.pdfIn PDF document text
    • http://sunshop.pro/samsung_super_writemaster_dvd_multib6oa0.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/Ljfgfhi/extreme_moto_racer_3d_apk_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/Z5Nieje/driving_school_2017_best_cars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_60074965a6ae3.pdfIn PDF document text
    • http://springtea.space/bujefabivudunomeb8sfpf.pdfIn PDF document text
    • http://groby-ritual.online/amazon_kindle_app_android_apkx3gak.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/mNIijjb/gemunojitulasidadukoriwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sadedegigagivaw.rf.gd/20784763760.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/15752138897.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/digitech_bass_synth_wah_manual.pdfIn PDF document text
    • http://ketanuviz.epizy.com/infection_control_ppt_template.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/36701805264.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/basic_weight_training.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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 4800 bytes
SHA-256: 31e0bc4b12a73df8d405517d7cebc3d8e7a5973fe42be2431dbba53e9c207784
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 10692 bytes
SHA-256: 17a07cda63d1f883eaddb6cedd1a13e0c6e75c3a12e947b14655c4eee88ae744

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