Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd77c26e7367e0c6…

MALICIOUS

PDF

75.8 KB Created: 2021-03-18 10:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 323f37c99b07f411f834b356de03995d SHA-1: 8c4c65dcec3b449b2628d23e5e4c99bee63eb5c7 SHA-256: fd77c26e7367e0c6f926f31f7bbf9ac8f99d19484b75c934fc3adde36a79edf2
192 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The presence of a 'download button' heuristic further suggests a lure to download malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=http+proxy+injector+software+exe+%2528v1.0.1.7%2529 In PDF document text
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/maxelajuxom-jogoke-gokusuzet.pdfIn PDF document text
    • http://besuxiju.22web.org/metabolismo_del_etanol.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/5595556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffc00dfc18de.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/rukuxoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fcda52c47642.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/bohr_model_worksheet_answers.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/xovekibuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60149bdacb2cd.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/how_to_clean_dyson_dc41_brush_bar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_604a26ac579fe.pdfIn PDF document text
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/dikedobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_601b2b194c14a.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/rinegizabawax_judafa_vufose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_6020768092cfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://figaniver.epizy.com/98951586731.pdfIn PDF document text
    • http://jogisav.epizy.com/130858221.pdfIn PDF document text
    • http://gawexerexi.rf.gd/bkav_home_moi_nhat.pdfIn PDF document text
    • http://nenilezum.epizy.com/69767665929.pdfIn PDF document text
    • http://kufelinal.rf.gd/noxurinajovujeno.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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 5796 bytes
SHA-256: b41f81fd13d028bcf50939fa050d83428141292097a89a793d377361012a8b10
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 11056 bytes
SHA-256: f0ec238eff8bfb50b478f55ce0bf7a4329efb30ce3556265ee881f2ec0bbde40

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