Malicious PDF — malware analysis report

Static analysis result for SHA-256 312fa4face7e9ff8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 05:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bd3e6153316db4a3596353198808e8bc SHA-1: cbc2644f685658067ae4680ac6a9f90d8fc490fd SHA-256: 312fa4face7e9ff84358b54b7891578617cdcca6ed6947d9e1114d01e03387bf
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as a phishing trojan. It contains a significant number of embedded URLs, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The primary malicious function appears to be the distribution of links to potentially harmful content.

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://dafemum.ru/wix?keyword=ipa+transcription+practice+british+english In PDF document text
    • https://vuguwawu.weebly.com/uploads/1/3/0/7/130776175/426815.pdfIn PDF document text
    • http://vituloza.sportsontheweb.net/sims_3_pets_free_download_mac_full_version.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/2863073.pdfIn PDF document text
    • https://kumumejetosen.weebly.com/uploads/1/3/0/9/130969188/e7e6991a5eff3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fdbaf0da7039.pdfIn PDF document text
    • https://xegabazoku.weebly.com/uploads/1/3/4/3/134318522/9530253.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuminex/i7hgYDr/jozoba.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/temipopul.pdfIn PDF document text
    • http://pagexanomala.22web.org/53143089378.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/zeromiwofumere-zolexaxutetixoj-gifujogikujija-bumufa.pdfIn PDF document text
    • http://lodamokabufena.22web.org/63796212558.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/ashirvad_pvc_pipes_price_list_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/hiLvueH/bloodsport_idiom_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6020a2e23d407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_6055657d110e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxefofoxomar.epizy.com/chaalbaaz_movie_3gp.pdfIn PDF document text
    • http://mifazafodig.rf.gd/is_there_a_playstation_3_controller_app.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 5272 bytes
SHA-256: ef5b48494e05e96f45f6e85cc9d283c6ad91d200887b059e68ac63291fd9072e
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 12316 bytes
SHA-256: 4950083b10a01c74710079012d0f588d96ed85648dd59c69505a0bf611c13218

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