Malicious PDF — malware analysis report

Static analysis result for SHA-256 88671c1e06136085…

MALICIOUS

PDF

81.4 KB Created: 2021-04-07 09:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f2ef848ba19552cb754af50aee24b31a SHA-1: 2bd9ed15818bcb834bf3fad0353429a27900b526 SHA-256: 88671c1e06136085ac7696e375a4ccb0d19f054888e07b10761e473d1ebf2fbc
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 pointing to disposable hosting, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=canon+sx700+hs+price+in+south+africa PDF link annotation
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/bilogofibobipe.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/winibewow.pdfIn PDF document text
    • http://rakuropa.iblogger.org/29877549686.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/laluzokowubavoxevegy89p.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/weebly_templates_2018.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/5515469.pdfIn PDF document text
    • https://jagaruwej.weebly.com/uploads/1/3/0/8/130874180/sazetinedodefu-mebanipo-gaxepafaz.pdfIn PDF document text
    • http://kvadro63.ru/advanced_structural_analysis_syllabus8rold.pdfIn PDF document text
    • http://sexurinugu.22web.org/suwobivatonik.pdfIn PDF document text
    • https://vakurizilobiwil.weebly.com/uploads/1/3/0/9/130969742/xovobojofedote_texetoduwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napuganenafu.rf.gd/english_grammar_in_use_fourth_edition_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdab939-88ca-482d-aa29-1371abb757f5/zonunu.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_c300e6c508cf4cb789dac147d0be8f15.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ab37a25c9d90486fa8629f509a55ba47.pdf?index=trueIn PDF document text
    • http://xoxadexol.rf.gd/genetic_testing_for_breast_cancer_nice_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fe5a15-7808-49fc-a2e8-5b9a0723cda9/setavavinoledaxux.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_f21d0c3c4686427996867882b5cd52d9.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_43b60d996257406b8e8d14af738f7e01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8a68d1-69a6-47bb-af5e-2179db37d643/what_is_the_cotton_setting_on_a_black_and_decker_iron.pdfIn PDF document text
    • http://novoboninixeme.epizy.com/71223207175.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_ddfffd1c768943dfb9da086948b18fb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5711965c-d8cb-4c87-b9b5-1ab2fe659f6f/olevia_tv_manual_537-b12.pdfIn PDF document text
    • http://kofukev.rf.gd/diaphragmatic_breathing_exercise.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_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 5264 bytes
SHA-256: 921a78b74f9dfa647835ada4cb3464aa41aa3dd0ce7af22ff01a6cbd0c8302d7
font_01_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 10764 bytes
SHA-256: c7035267f2c14fb329fc5e97f30b591239dedd64738323cfc4bf09a7739329d4