Malicious PDF — malware analysis report

Static analysis result for SHA-256 398ea0aaa6c6d036…

MALICIOUS

PDF

75.3 KB Created: 2021-02-26 07:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0dab583f8896178a5a8d0c7607c47da0 SHA-1: ae8a505f8db2a5bf4b30318856d2b2b609e22c07 SHA-256: 398ea0aaa6c6d03600df2edfe34328154b978babea9186de5da6dea25c735e06
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is used for phishing or distributing malware. No scripts were extracted, but the extensive link farm indicates a probable attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/wix?keyword=iron+thunder+monroe In PDF document text
    • https://cdn.sqhk.co/jasowipe/RUghThh/95700965854.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/poxuvew.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/ridibaxodematuv_divigux_nuxiloti_xakogijiti.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/uia6ije/smurfs_village_mod_apk_2020.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_size_needle_does_my_sewing_machine_need.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/lomokuxirevaze-pefopijutaxeji-zawabaxex.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jiNCMUT/wiketude.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/temapotig.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/hdjfnjd/joan_didion_play_it_as_it_lays_goodreads.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/jelegedirib.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/tivive.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/veduwevuveni.pdfIn PDF document text
    • http://legizoro.epizy.com/divodusejowawodilodusama.pdfIn PDF document text
    • http://mimiwuzoxul.epizy.com/wixinee_qorannoo_afaan_oromoo.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 4584 bytes
SHA-256: 5dc4b17990264d41999436671db7c93daeb23457c03dc0960bd5e04047e229e0
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10984 bytes
SHA-256: 90b0bf56c0750dc4bc8ff6f5e8e06747361b9fb36b25362283f3924508d61254

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