Malicious PDF — malware analysis report

Static analysis result for SHA-256 c503014b04b17a06…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 17:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9bf737b21eb741867748c764289848aa SHA-1: 20693aa37082d7694c2a21300e2ae52400f957c8 SHA-256: c503014b04b17a061b05a60c05031f642cf094faf3efe356db3cf7b1b379455b
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of multiple links to disposable hosting suggests a phishing or scam attempt designed to lead users 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://yafferge.ru/strik?utm_term=dixit+memories+cards+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5fc6c25949adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6014d3f4e251f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_6018c8b4a892c.pdfIn PDF document text
    • http://damvglaz2.xyz/makixex3wn7.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/GjggifR/71720758722.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/29250253295.pdfIn PDF document text
    • http://cashfree.store/anti_rollback_androida3zcv.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/hp_2620_printer_price_in_uae.pdfIn PDF document text
    • http://thechambre.xyz/how_to_remove_pine_sol_from_carpetu113c.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/vagibejuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/kanojasav/dwziiig/hockey_goalie_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/Xajirgd/mirror_of_erised_tattoo.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/vavale/appium_studio_for_eclipse.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/soar_con_que_se_te_caen_los_dientes_de_abajo.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/20132586747.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/action_movies_english_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/advanced_players_guide_pathfinder_2e.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/circuit_maker_linux.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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 5336 bytes
SHA-256: ca782da0ac717866fa0a3c4b3b46a6bc32c01b23e21aff8e0b18f039858f5840
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 11696 bytes
SHA-256: c83b43ae6dfd7c032c5bd0f5ad31c3656ab04d466a3976470ed45bd4afa7a383

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