Malicious PDF — malware analysis report

Static analysis result for SHA-256 946c3ba9fd5ac713…

MALICIOUS

PDF

88.3 KB Created: 2021-03-19 14:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5e64adb7d0098b6e4ebf7780797fd304 SHA-1: b439ec3183c284f5c9e20584d9c20b0831e5af70 SHA-256: 946c3ba9fd5ac7133d6a0a797b1ce4ef8f86fd589362f5065bb9ad6b24db6794
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pelibifir.ru/award?keyword=princess+agents+novel+english+pdf+download PDF link annotation
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/f13962.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/jubanavuwamexes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_6018c08d9d08f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fd199d82db4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6034d0a4cd714.pdfIn PDF document text
    • https://wisemawuperu.weebly.com/uploads/1/3/0/7/130738751/wojanuwemagilili.pdfIn PDF document text
    • http://easterthjg.com/zufanovuxomolonadotido1c7dt.pdfIn PDF document text
    • http://psychologyrelax.xyz/69277693220losuu.pdfIn PDF document text
    • https://wojaduzojipoj.weebly.com/uploads/1/3/4/4/134467580/2257337.pdfIn PDF document text
    • https://teleroxekafi.weebly.com/uploads/1/3/5/3/135321942/83bc1a50754cd.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/gefomudamuja_wakada_ronabezipa.pdfIn PDF document text
    • http://sfr-espace.best/palanca_polea_plano_inclinado_torno0q91l.pdfIn PDF document text
    • http://braco.ru/what_happens_to_percy_in_the_lost_herohgmex.pdfIn PDF document text
    • https://xodovasiwuton.weebly.com/uploads/1/3/0/7/130776096/1487496.pdfIn PDF document text
    • http://fimewot.xyz/public_relations_internships_los_angelesev72s.pdfIn PDF document text
    • http://adv-workshop.site/how_to_logout_of_netflix_on_dish_hopperh5ml7.pdfIn PDF document text
    • http://naturalik.fun/17700098176nmo3b.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/903502.pdfIn PDF document text
    • http://bcipreactivaperu.com/college_student_interest_surveylf60y.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/17f5a59e58b.pdfIn PDF document text
    • http://hookup153.online/bendy_the_ink_machine_apk_moduiysn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/457c0a89-c5fc-486f-a391-7adbfc650963/12040520180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc02daf2-d9d2-4afb-910d-7cb4cdadceb4/how_do_i_fix_my_water_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6d0cd3-a024-4487-ac19-8d939e73529a/ley_aduanera_2016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 5144 bytes
SHA-256: 94018786d97ef94c1edfe5cb436dcfcbc313dbe7e78ca340974652e13c099638
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 5572 bytes
SHA-256: 4875c7cbed5471fbda45c99a6d6d720d3419cbff26b508c2a194eaf8582228fa
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10552 bytes
SHA-256: 0fe7d0fddae46b3a3563a8df6931858ec984cdd1ed81289a7c3b262d8aadb6b6