Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd50e32d24ad4965…

MALICIOUS

PDF

72.4 KB Created: 2021-02-19 00:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ca51b71bcc0cc8ebd8f087f1965cc4de SHA-1: 917fa05bfd5103881edda1a050c0badfee52015d SHA-256: cd50e32d24ad4965b5355fe70b6e9ea42ccdebbcfe5db5376e86e405d26a926b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely used as a spearphishing attachment to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/strik?utm_term=percy+jackson+film+2+trailer+deutsch PDF link annotation
    • http://garant-ritual.online/vr_v8_brake_boosterf0a6c.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/JwqhaTa/76228108037.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/eRhhii3/good_captions_for_pics_with_your_dog.pdfIn PDF document text
    • http://roflan.site/opera_mini_fast_web_browser_download_for_pc2rkeu.pdfIn PDF document text
    • https://cdn.sqhk.co/lopovekis/iehjLAV/monster_trucks_youtube.pdfIn PDF document text
    • http://good-production9.site/wunaraperaretikifd3e0s.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/b53d1cb.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/bevivopijokani.pdfIn PDF document text
    • http://reduslimitalia.website/goupil_g3_manual1zi3a.pdfIn PDF document text
    • http://dream-stat.ru/sunikewupccj7.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/7jfg2jb/sad_whatsapp_status_video_download_female_version.pdfIn PDF document text
    • https://cdn.sqhk.co/rofezurit/iggFidI/44596696187.pdfIn PDF document text
    • http://sq11mini.com/religion_god_dialoguesiz5nq.pdfIn PDF document text
    • http://polfact.site/geniddk0ri.pdfIn PDF document text
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/8793395.pdfIn PDF document text
    • http://persequen.com/cableado_estructurado_cisco3u81a.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/PKcCgjG/79592972033.pdfIn PDF document text
    • http://bu-markett.com/blake_chart_worksheetllwkx.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/wovugi/how_to_start_a_computer_repair_business_with_no_money.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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 5636 bytes
SHA-256: e3da2a7f78c395118c94607f140a4e7b680fe52ec0625056eb6edc51a66bd53d
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 11560 bytes
SHA-256: 9053a7cde50d43e377e7225bc54a9831465bc1618dceee47688bfcbb1647f408

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