Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84cc3e7b9aa280e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 08:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9830f4f73d041f918dbdcef6bcae02fd SHA-1: 1dcc1589c51822697af8990079f953372ce7688e SHA-256: c84cc3e7b9aa280e634853974004d51bd010146f69613b24283ecf7e57b9c1b0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/wix?keyword=brown+girl+dreaming+jacqueline+woodson+pdf PDF link annotation
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/f709b.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/53399aaa.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/pefojerabezularotemimosep.pdfIn PDF document text
    • http://javoreruja.iblogger.org/how_to_remove_lint_from_bosch_washer_dryer.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/business_plan_free_download.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/nidewig.pdfIn PDF document text
    • http://funusiwevig.22web.org/basic_computer_course_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowawese.rf.gd/xaluvuzavonew.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/nelibomalo.pdfIn PDF document text
    • http://xegiseko.epizy.com/minuxajazes.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_f105067c35be4716b5d8a3f09bfcb78f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/camera_360_free_for_android_phone.pdfIn PDF document text
    • http://vezifapix.epizy.com/bibeminimudewejedojogowe.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/mirofeto.pdfIn PDF document text
    • http://pixafur.atwebpages.com/chapter_viii_first_stage_of_the_revolution.pdfIn PDF document text
    • http://titarejidawe.epizy.com/bhoothnath_returns_full_movie_free_720p.pdfIn PDF document text
    • http://rimatos.epizy.com/17981960041.pdfIn PDF document text
    • http://jumezasaguruwu.epizy.com/berutowobu.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/rotuwazirawune.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_12b81a4c6f204fedab01e8d255f2169f.pdf?index=trueIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_c67bc69254a1412eac2cc2cbb2424932.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/beats_studio_3_wireless_vs_bose_qc35_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/29348381711.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_f987210c43354133b146fff669948796.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_004f05775bb6401d9c17ebcbffeef4f6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 5816 bytes
SHA-256: 9e60361f3ff604c66aea034e125b785e9c835ec185c1d03e5f973896effd2946
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 10772 bytes
SHA-256: 7c42548e9703bd2819ba0240232a1a2cb6ce65d450efedf39bad00f188d3a9be