Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d50138e6566d00…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 01:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2e22851402d54ad58ef376339cc35cf5 SHA-1: d8270c9957a4f7f88d89b335f5df07500649248c SHA-256: 34d50138e6566d00b717b659ff5be1c70051d4540bd61f3bcc9d9b46fbeec1c6
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 pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection campaign designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=best+browser+for+android+4.+0.+3 PDF link annotation
    • https://zunovuxosuseso.weebly.com/uploads/1/3/4/4/134497136/b874f685c4.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/zagenura_jagesojuv.pdfIn PDF document text
    • https://madapupe.weebly.com/uploads/1/3/4/6/134667506/28312.pdfIn PDF document text
    • http://knitfqph.site/sample_block_letter_format_examplecagd5.pdfIn PDF document text
    • https://mofaxogarapew.weebly.com/uploads/1/3/4/7/134771612/rapixojijotazenefo.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/jebeberojumadupufuba.pdfIn PDF document text
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/polelugul-walizabexesog-bedolusapotopow-fabemiromevo.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/saganominidimi_gebomo_vivotuvod.pdfIn PDF document text
    • http://uscreditmonitoring.info/41092473797b3oky.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_5fe11e8362175.pdfIn PDF document text
    • https://lalexitadonu.weebly.com/uploads/1/3/0/7/130776325/nuzib.pdfIn PDF document text
    • http://enots.space/barbara_o_neill_books2qnu0.pdfIn PDF document text
    • http://studytogether.fun/lijekababodedemelemomofaplvspx.pdfIn PDF document text
    • https://kejojotevunujip.weebly.com/uploads/1/3/1/8/131871587/sedelolixobajuguwiza.pdfIn PDF document text
    • http://about-igsupport.com/muledoralexavukedusezonu4l030.pdfIn PDF document text
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/jazoxegukura-venaf-wotadofalonemuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_604953ab12dea.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/969b01f5-6b27-41f6-a9e8-0f00a28ae133/how_to_pair_a_wireless_mouse_to_a_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead5753c-b699-45c5-a206-a102c3ef6380/android_app_development_manual.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_f6abd47bd5d34e13812d7c36d3281044.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_80e45294e52b4c4090e8b7295e5698ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da97b8d-8b75-4789-b386-e44473585b9e/76394243169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29426564-cf02-4b0c-8873-088c32a9ad15/red_cross_lifeguard_recertification_covid.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_d5bed607d17049668bfb601c9d4cd8b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be32d456-15ae-4426-900d-6ceee96147c9/what_are_the_elements_of_systematic_approach_to_teaching.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 5576 bytes
SHA-256: 893e5e07c78ee7d3d78b174941fd784d2c4254046ccccce2ff8ea040058c00e3
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10484 bytes
SHA-256: ebb65ff6e6dec3aeb3dee7be76919602c8456fe8b5f0db6f1aeaa2fe57cfe800