Malicious PDF — malware analysis report

Static analysis result for SHA-256 58819fbb44eb8979…

MALICIOUS

PDF

70.5 KB Created: 2021-01-24 10:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b626d126f555a0e314882d735737c59 SHA-1: d25a506205aa05fbde4717a0597772c9dbbda514 SHA-256: 58819fbb44eb89796c7762e0658ec00673b5887e140b12677fe02eec8732601e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Whatsapp latest version 2018 apkpure', aiming to trick users into clicking the malicious links. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=whatsapp+latest+version+2018+apkpure In PDF document text
    • http://kokilubowo.22web.org/59499270063.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/heijbLS/31987869840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_5fdc77e359a47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369334/normal_60092cef5fe79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_5ff17bb940f48.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/rjiTGcL/nezegarerexopaxomati.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/oHijzOH/excursiones_cruceros_mediterraneo.pdfIn PDF document text
    • http://viwimewi.22web.org/ditorepufapefibiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimonaker.epizy.com/field_view_care_home_cqc_report.pdfIn PDF document text
    • http://telawusufolij.epizy.com/alcohol_detoxification_guidelines.pdfIn PDF document text
    • http://xegunapajom.epizy.com/can_t_touch_this.pdfIn PDF document text
    • http://ferodokibaw.epizy.com/ritaluveko.pdfIn PDF document text
    • http://pejenusiloxo.rf.gd/zofupo.pdfIn PDF document text
    • http://numivonef.rf.gd/85842376768.pdfIn PDF document text
    • http://zusewijoje.epizy.com/52595528999.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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 5564 bytes
SHA-256: 9e790b13fe5f2e3a82567404757ba0cb8220537ec70a9199018d6aca5043a650
font_01_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 11004 bytes
SHA-256: e4a55a39fe8f3e64e92f52ce15151b01a6e649b1d6955a9f87403b2aed57ef1f

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