Malicious PDF — malware analysis report

Static analysis result for SHA-256 a217a1ac9e48eaca…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 12:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: af6d5b0352f93c5b5a156b6b0c792058 SHA-1: 4d63a69290913af0a6a3ddb95fa79e9f95189519 SHA-256: a217a1ac9e48eacaff61e51825b8286d8bd337ead2854fb790454762cb4ade45
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to suspicious and disposable domains, identified as a malicious redirector and a link farm. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content.

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://dafemum.ru/wix?keyword=curry+leaf+plant+sale In PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/xotob_dasewapep_visituwa.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/wonikijoxek.pdfIn PDF document text
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/33e76.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/what_is_social_construction_of_reality_theory.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/80479404720.pdfIn PDF document text
    • http://zupezejukiselu.22web.org/marine_corps_medal_mounting_order.pdfIn PDF document text
    • http://tawabuzawi.iblogger.org/binary_system.pdfIn PDF document text
    • https://ruxakidefo.weebly.com/uploads/1/3/4/1/134131713/7e8aa8750d97.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/fuzikawajazotalesi.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/14527532876.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/personality_and_social_psychology_journal.pdfIn PDF document text
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/tawabudoxigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/basoxadafo.pdfIn PDF document text
    • http://lajexexetawibo.rf.gd/43314295195.pdfIn PDF document text
    • http://xumuturil.epizy.com/what_is_first_conditional_sentences.pdfIn PDF document text
    • http://folusezik.epizy.com/judesizibuwifukofaloja.pdfIn PDF document text
    • http://kojomazudogog.epizy.com/vokelijirasezetusofoxe.pdfIn PDF document text
    • http://wemurabasuxekux.rf.gd/how_do_i_know_if_my_vizio_has_smartcast.pdfIn PDF document text
    • http://riwigov.rf.gd/heart_broken_status_for_whatsapp_video.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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 4904 bytes
SHA-256: 6020b4eccfcfcb7d7a1f24c3fbe67e18641dbc111b00d94feb9c556f7be2c60c
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 10368 bytes
SHA-256: 089e0fbdcb238804cd32e6b24769e76172792cebba1cacb331a6b39f3cac0832

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