Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c0e1ca1d0a8722…

MALICIOUS

PDF

78.1 KB Created: 2021-01-19 11:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b665c309ec43d2e301f0b258bbaffe5f SHA-1: 8e26ba6c1166c0527bf582e3c0a6ee1a7d08dd8d SHA-256: b5c0e1ca1d0a8722bdb56a17e0efb7a5f205c5ae7e0a3e607d3f93b2b08da67d
194 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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/wb?keyword=wordpress%20plugins%20free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fa88c03bfe6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffa44415527e.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/pKl4Thb/callaway_mavrik_hybrid_vs_epic_flash_hybrid.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/iitibZY/guncrafter_no_name_government.pdfIn PDF document text
    • https://cdn.sqhk.co/vabilafibalu/jgdn7rJ/12717304135.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/7654715d5bc.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/H9jhxji/vasanifoxekokapevokab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fb684b6bdada.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/higyjj2/7744149847.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/wuliruromamoxak.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/boxipefaxoz.pdfIn PDF document text
    • https://site-1171686.mozfiles.com/files/1171686/5980706821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f96a2aee6995.pdfIn PDF document text
    • https://site-1175261.mozfiles.com/files/1175261/ddpai_x2_pro_dual_channel_car_dash_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/Z6oifig/guess_telugu_movie_names_handsome_little_boy.pdfIn PDF document text
    • https://fojejebub.weebly.com/uploads/1/3/4/2/134265807/a5fd9658b99e.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/3Zic7VC/39881594458.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/gthKggK/highway_zombie_hunter_apocalypse_shooting_games_mod.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/temujonuwu/depuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/astm_a370-_14.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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 5012 bytes
SHA-256: 2f7e43f395da92e54ea504db210d00b1e4751b6db47126c215c4e16be4814bf7
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 10472 bytes
SHA-256: c26f96d2ae53fb4080340a008ee534739d5749dd290fbb5b461e9a48efc2d85f