Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6c15bd30f5862b…

MALICIOUS

PDF

70.7 KB Created: 2021-02-12 07:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa8be9045eebbce038a8fd027ac7ee27 SHA-1: bf3c62f7123ffb565a264466babf7c051e267686 SHA-256: 4a6c15bd30f5862b5d7a4b2ac9e64a16a504803bd8b8eb7fdd82a6192909aeaf
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with several heuristics indicating malicious redirector links and link farm activity. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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
  • 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://yafferge.ru/123?utm_term=algedonic+by+r.h.+sin In PDF document text
    • http://honey-love.ru/46423932175gq6l6.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/sDsxchb/juzefa.pdfIn PDF document text
    • http://orbitan.fun/3995836243232b8r.pdfIn PDF document text
    • http://fifonugimexa.22web.org/whatsapp_versi_android_4._2_2.pdfIn PDF document text
    • http://kyukty68.xyz/2651708595prkrs.pdfIn PDF document text
    • http://wigomufeze.22web.org/vezusisoxemelavoduwar.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/igjfE99/dutonukoti.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/pajirasen-bagatape-wazebuwizil-tizozume.pdfIn PDF document text
    • http://all-system7.club/30536795802b6eup.pdfIn PDF document text
    • http://merishwheelrecords.com/nitusixemeruwwwws.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/24080464144joeh0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezibetaw.epizy.com/58598933410.pdfIn PDF document text
    • http://dekamikopegem.rf.gd/vavofamikalikavajesujokaf.pdfIn PDF document text
    • http://tafekeremo.epizy.com/ala_vaikunta_puram_new_song.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 5256 bytes
SHA-256: 0f4de9852e8e131a2b2d75682aa4f651db29ea194778a915398df7d6d41983b9
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 11084 bytes
SHA-256: b37c028d700ed8359a9a998ffd5c42d51e466094914fb495f115b432826cb2de

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