Malicious PDF — malware analysis report

Static analysis result for SHA-256 6203eae66f2acd47…

MALICIOUS

PDF

79.1 KB Created: 2021-03-04 12:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 49a99a44d6d24c076531f7ab1f74c27a SHA-1: 5efee6f6450c0c8a4c82a21b57146b2330619b46 SHA-256: 6203eae66f2acd473d16cd4ae01d9888593d2f891d5e81de257a9579720418bc
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be garbled, but the presence of a URL with a 'utm_term' parameter suggests a phishing or spam campaign attempting to lure users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=central+pneumatic+6+gallon+1.5+hp+150+psi+air+compressor+parts In PDF document text
    • http://espaceclient-cmb.com/what_is_shared_knowledge_tokeir8q.pdfIn PDF document text
    • http://fastnoutservice.ru/jajusikasukazezexabonuijlcf.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/95576228037.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ic4zjeO/52214054634.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/todidirofagu_nuvaxoredex.pdfIn PDF document text
    • https://verebabivudasa.weebly.com/uploads/1/3/4/7/134771522/nobonakupasi_lotubodiz_kenorurag.pdfIn PDF document text
    • http://cuzinfo.ru/549953498344c6om.pdfIn PDF document text
    • http://kudukulid.22web.org/volewolasekodewivawuwopa.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/resixexi/jejuzegerut.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/23463775937.pdfIn PDF document text
    • http://gaxijejazaxedaj.epizy.com/my_bloody_life_audiobook_free.pdfIn PDF document text
    • http://juwebud.epizy.com/apex_release_dll_mafia_2.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/gregory_pediatric_anesthesia.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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 5756 bytes
SHA-256: ddd3875f0c35b3eb5180eab7011778c226ae90b25af3c8b27f05428257b3b08d
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 11392 bytes
SHA-256: 9228018877c22f91b09fcc102fe7d75152362cb18f10bda91f9f7154eb96ed66

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