Malicious PDF — malware analysis report

Static analysis result for SHA-256 9743d24b30da691e…

MALICIOUS

PDF

86.6 KB Created: 2021-03-09 00:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab14ae1d85400eb473870d42cdbed85a SHA-1: 8af3b6686f43f650dbfc95c726aa42fc8d20741c SHA-256: 9743d24b30da691ef647953a3b7cab8fb7417e5e57c4ca0d5a0753571e0a0781
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://jumiwimov.ru/award?keyword=ascite+cirrose+pdf PDF link annotation
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/zamovetivazesagowo.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/ibigfut/green_farm_3_para_pc_windows_7.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/92339505263.pdfIn PDF document text
    • https://gitizurozid.weebly.com/uploads/1/3/0/7/130775734/vozixuxi_loselojumit.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/list_of_companies_in_tamilnadu.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/3203900.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/0iehi8Z/wirowuwirijetixel.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/echo_pb-250_wont_start.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/fojorineje.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/86856678031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/39165949497.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/mastermind_use_of_english_answers_online.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_0ef9b1b223e248ca855a15230bfce737.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_a1752089620e4fe2aeeb5da1c4b6fe30.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_39c87d743e0b4014957ac595d21e96d1.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_e6b18e2d098d4e2799ee390f9bd605a5.pdf?index=trueIn PDF document text
    • http://wovibojo.onlinewebshop.net/dodevurorutuzelarakuz.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_6e3f96f51663443aae10da96065b63b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/android_studio_app_icon_size.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_12f477cc91a44b11a2c9bf1b3d929e52.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_9283e0111d994bf7b926ab761bf74c4a.pdf?index=trueIn 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_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 4576 bytes
SHA-256: c4471f49983ca145eaf05934fa79ea2e1940ea87a08ae1a7e9c84267b98b2d5a
font_01_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10764 bytes
SHA-256: 0bd8c839462db18d17800876a1a95200c05146912745c97a0039050b8b165745
font_02_sfnt_off00013ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34