Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13f9322430ea9fc…

MALICIOUS

PDF

79.6 KB Created: 2021-03-13 18:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 60a9aa22efffac6a97499fc9018d31c7 SHA-1: 44a49c83159b0b62ba581bfc1de70fb84208800c SHA-256: d13f9322430ea9fcd3b19e302eccaa1b785488828c6ed8e5d8b1ff163449e03b
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 pointing to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=invicta+venom+watches+reviews PDF link annotation
    • https://cdn.sqhk.co/gilevetu/7xWnujb/extreme_car_driving_simulator_gioco_online.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/2058272738.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/ghg20gj/police_motorbike_driving_simulator_3d_apk_download.pdfIn PDF document text
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/8090996.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hcNjdii/bay_farm_island_alameda_map.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/5724361.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/pebudodikunafiwinife.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/dgcyhd5/heartgold_elite_4_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/ie0O4hg/sutijakifibaz.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/ieifjiJ/20429444467.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/f7F1nja/fidolum.pdfIn PDF document text
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/71eea8b217994.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/tujeviwakirawu/lorukogufis.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/mumejogetenud.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/california_dmv_driving_record_report.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/is_bottled_water_free_on_royal_caribbean.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/les_trois_mousquetaires_dessin_anim_episode_14.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/sennheiser_rs_175-u_digital_tv_wireless_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/40023797807.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_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 5096 bytes
SHA-256: 676a40b0e4be934481aa4110af169cbed9def42b45a6b492403feddd1e9a08ad
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 11580 bytes
SHA-256: 64b7c72496893f2567ed3772147fb0aedb196cb062e2b4e36e421fb2d219d2dc

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