Malicious PDF — malware analysis report

Static analysis result for SHA-256 f599fa083f5c2a4a…

MALICIOUS

PDF

68.0 KB Created: 2021-02-27 11:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a37678a464e7bd535a3fe4a4d052959e SHA-1: e113534855d8add9115a952cec2ab8e94e348b06 SHA-256: f599fa083f5c2a4a38bf446c356e38eaa513cf2b14c310bbbede60b9edbe364a
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, 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 an attempt to redirect users to malicious 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://nipisod.ru/aws?utm_term=how+to+use+formative+assessment PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368244/normal_5ff29c38554d0.pdfIn PDF document text
    • https://befutoxe.weebly.com/uploads/1/3/4/4/134443098/gobasego.pdfIn PDF document text
    • https://depagolal.weebly.com/uploads/1/3/0/8/130813973/909422.pdfIn PDF document text
    • http://copyrightreports.com/arap_sabunu_ak_formlywx5m.pdfIn PDF document text
    • https://sopetenoredu.weebly.com/uploads/1/3/5/3/135318191/juvavu.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/76877482775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_602e7191e788e.pdfIn PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/5652332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_602d1ca1570bf.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/what_does_the_car_symbol_on_my_dash_mean.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/gofoxuzupesivugur.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/6cd2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5feb890ad8868.pdfIn PDF document text
    • https://tedisizizifem.weebly.com/uploads/1/3/4/2/134235801/pidujuzokixo-keranokexab-xagibep.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/taririp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5fdb1cbd1d299.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/lunojol/kegagari.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/online_chat_games_with_avatars_no.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/brakeburn_shoe_size_guide.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/resumen_del_libro_tus_zonas_erroneas_capitulo_2.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/4th_grade_math_games_jeopardy.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/50645112193.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_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 4992 bytes
SHA-256: 95af48dc5374e0a511ae9e8afb7ad8f0c2a60d950c1b8d5d3e10d9795b38bf16
font_01_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 10196 bytes
SHA-256: dce5b8a772dd79fcdb72f08f782e808a540fdb3c73a3a770333f7a6a1aa7bf37