Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fc8bd6c67bed77…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 21:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bb307d61e077fad0b85d8cab3a8fcdf6 SHA-1: bb3c76c891877f5bee7e2354aaed41fe2df8613e SHA-256: 54fc8bd6c67bed77917d17032a4192ef83b790928b0603d9949df954a3d89c04
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'jottigo.ru', suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to search terms and application metadata, reinforcing the lure. The presence of multiple links and the overall structure indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/wix?keyword=amature+fishing+tournaments+near+me PDF link annotation
    • http://doruguduku.iblogger.org/how_to_install_pelpro_pellet_stove.pdfIn PDF document text
    • http://gunifewut.iblogger.org/brachiopod_morphology.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/gieuhgm/pejafufusiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/egjhhba/likert_scale_analysis_excel.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/a9825bad-9258-41c4-bc02-8ed3def770a0/58919748618.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/zotugewuget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0677cb35-3315-4e61-9542-3ee9834c84e5/what_are_the_principles_of_phonics_instruction.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/hilde_soul_calibur_6_guide.pdfIn PDF document text
    • http://palexibibiw.atwebpages.com/tetopolujewebunifeto.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/25621409105.pdfIn PDF document text
    • http://gusizozubamu.epizy.com/64737421215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f1fad4-7f62-44db-8eec-9f2e994096c8/fizedekodezesom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d92ed0-bf8a-4359-bb38-ee56301d343d/what_are_the_different_comcast_tv_packages.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/10577667489.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/guidelines_for_diabetes_type_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc310c4-0efe-4ca2-8a10-87b8376c29f8/poputenit.pdfIn PDF document text
    • http://bogetezapore.rf.gd/10934288313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e70e54-7935-423b-8b61-13e6a0ec0a0e/linitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473442a7-15fe-49dc-b0fb-2814338dbc4e/21630818698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e98c05-91f8-4252-ac9e-3d1e9c36df42/55168074831.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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5136 bytes
SHA-256: 53e5b2786038efe274dd737bd17b41e33e415e806f184fb02064dbee2f8bc59c
font_01_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 11564 bytes
SHA-256: 246351dcd670f4c7f1e9c357d4c5e93d97ecab43f3f267512892ebfccf546ebc