Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fd946869fbe0f3…

MALICIOUS

PDF

74.2 KB Created: 2021-03-24 11:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb7726b268dcfd22ad1690b9f1bbae3e SHA-1: c187bb8fbaefb57f361d402ac4065b9e0804e53e SHA-256: 27fd946869fbe0f3d430803deef8532854a671a8d1ec4d963520d32f700440c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('soxebez.ru' and 'gofadivus.mygamesonline.org'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=diciembre+en+ingles PDF link annotation
    • http://gofadivus.mygamesonline.org/86143209823.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/tank_cowboy_bebop.pdfIn PDF document text
    • http://sajitalunaded.22web.org/algorithms_illuminated_tim_roughgarden.pdfIn PDF document text
    • http://lomizagin.iblogger.org/xibexelifibitaji.pdfIn PDF document text
    • https://zidifupo.weebly.com/uploads/1/3/4/4/134475425/9aaf765e.pdfIn PDF document text
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/5502151.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
    • http://boluwugotesuni.rf.gd/calligraphy_alphabet_fonts.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/what_is_an_example_of_synthesis_in_literature.pdfIn PDF document text
    • http://kujavuven.epizy.com/45711211797.pdfIn PDF document text
    • http://desetezovadu.epizy.com/makov.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_94f19273e0234ebbaab5b9809134ea48.pdf?index=trueIn PDF document text
    • http://pulavoxojefu.rf.gd/diccionario_de_filosofia_jose_ferrater_mora_tomo_2.pdfIn PDF document text
    • http://melibeduzos.rf.gd/zugamevunimojomevaxe.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_f48bcd9801e54a47a347a00e6fd29b37.pdf?index=trueIn PDF document text
    • http://paguxesij.myartsonline.com/alman_dili_6_ci_sinif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c711852b-8c91-49ea-9215-0256b26398f8/what_is_the_importance_of_academic_text_in_your_life.pdfIn PDF document text
    • http://bidadefaj.epizy.com/sushant_singh_rajput_new_movie_songs.pdfIn PDF document text
    • http://gumupomomoripu.rf.gd/40mm_bofors_gun_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4646699f-82c0-4fa6-9461-94facb9456fa/81167671575.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 4644 bytes
SHA-256: 0f994218faa8196141145f6609aae5f71608543032bb218f6c49b4d54dc65e4a
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 11104 bytes
SHA-256: ab784968fa88606c164635eec300011e3fc40c3847f899d6ef255fefca64396d
font_02_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e