Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f66fca85fe3de2c…

MALICIOUS

PDF

82.9 KB Created: 2021-03-26 07:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d3554e24fc211820d0e88811459f982 SHA-1: 1530cc99e5e33d1e615ce1fde7d3f418038a5e70 SHA-256: 9f66fca85fe3de2ca85cb7a4912c7ce2e316e3235058a86680010a9e726b921f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/wix?keyword=geography+bee+2020+quizlet PDF link annotation
    • https://cdn.sqhk.co/vusanutoj/jjklJgF/group_join_link_for_whatsapp_apk_download.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/how_many_words_per_minute_should_a_fourth_grader_read.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/72338217126.pdfIn PDF document text
    • https://cdn.sqhk.co/xobakidanav/hggfmhj/rilaganelibexidifor.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/5hciijc/electrolysis_gcse_exam_questions_and_answers.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/bgp_interview_questions_and_answers_download.pdfIn PDF document text
    • https://korudodigujoko.weebly.com/uploads/1/3/0/7/130740169/topidikubid.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/rasevinono.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/887c575.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/lafomamamu.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/zemajubemamuzakobeb.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/hgjhbjj/stattraktm_mac-_10_neon_rider.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/XPgfEDZ/ravens_steelers_news.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/dawozazesolekuxeru.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/ie5jfFz/52198846482.pdfIn PDF document text
    • https://puwikemumej.weebly.com/uploads/1/3/1/4/131454306/2329830.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/jechbcR/zotejuwevumet.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/hhqEiew/download_bhop_pro_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/6KjfGii/fuvagafalewigoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_bb7ad6c5d9ef47419ac9b60bd83d9f02.pdf?index=trueIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/data_structures_and_algorithms_notes_for_bca.pdfIn PDF document text
    • http://tonorepunad.myartsonline.com/96842446145.pdfIn PDF document text
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_a15f9769d1fc43fbb828a36bb5379a73.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_97d788339a7f4d58aaa50231eaa26728.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_95e69883cc844c498d214fa61f119a93.pdf?index=trueIn 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_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 5628 bytes
SHA-256: 548cc2b10787d3face1fe0fb9084dd304eff9d4335f9f65b3482afa63686fe8e
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 12540 bytes
SHA-256: 67a0992f05bc392963adfffb9aa5510fb3bb63eae6a8f0641fd854ca30acc07f