Malicious PDF — malware analysis report

Static analysis result for SHA-256 c853f43c3a231737…

MALICIOUS

PDF

78.2 KB Created: 2021-03-01 11:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 175da9f5164300bcdf558db6e1f1765c SHA-1: f1a380a42126cbf39d1739ab3e63f0e73134dc1f SHA-256: c853f43c3a231737b543b2465dac4e96520a5ab915ac3d0dc474fe202f7887b7
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing SEO-like tactics, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=data+science+for+business+pdf%25E4%25B8%258B%25E8%25BD%25BD PDF link annotation
    • https://cdn.sqhk.co/xosifusozat/aMJtqgh/fall_parkour_guys_run_3d_download.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/2421099.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/ms_drivers_test_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/gfjfUhh/dragonvale_egg_of_mystery_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/aMghhjb/zombie_hand_sticking_out_of_grave.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/piwenelasanoxusek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fd7b37a1eb1f.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/how_to_know_if_a_car_seat_is_faa_approved.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/jjKghie/let_s_farm_hack_8._19._01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5ff24036b5b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_601794777f426.pdfIn PDF document text
    • http://bubble1.space/data_structures_in_c9vh6k.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/9430101.pdfIn PDF document text
    • http://bupro.asia/bear_city_full_movie04pm2.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/sesusova.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/bjfigc7/tokaido_gi_south_africa.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/fewifuwu/87466362049.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/wibopewinimi.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/venewuxutitukilefaviz.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/is_online_raffles_illegal_in_philippines.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 3304 bytes
SHA-256: e9df1abf47a688c52bbf36275161d4c71dd3d5463c3e540779115c3c600865d9
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 3328 bytes
SHA-256: f330ce40808d65e35f00ff4532c21be17503ba883170be5f18e483240324f464
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 5256 bytes
SHA-256: a58e1721121ab20d958484ebd9ba1672914ff04f2a057c9bb789be2b2a3523e0
font_03_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 10424 bytes
SHA-256: c4541a2341045b9dbbb57ab860cdb5725a1809804071302a82fd199ff1da0571