Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed266ab737450461…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 10:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 95df01e6adc71b7c0c31054fef61c34c SHA-1: c568bcc854eba8dd237f90a4abcf4d49ef035169 SHA-256: ed266ab7374504614122b5591538d5b281619fcb12de32be64224c6be13e84eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a heuristic indicating it's a link farm on disposable hosting, suggesting a phishing or scam attempt. The presence of a 'download button' lure further supports this, indicating the file is likely intended to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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
  • 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://midufefew.ru/strik?utm_term=10+days+to+faster+reading+epub+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470689/normal_60136b57a0ec7.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/wikoniguwojabob-lidozirolari-zoguxobada.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/2eb5b42f4.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/pVNwi4f/novartis_corporate_responsibility_performance_report.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/bgihihd/60772415074.pdfIn PDF document text
    • http://umdtheatre.ru/who_died_in_13_reasons_why_all_seasonsdij11.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/cHhgfVe/winofubowonubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd27bec356e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_60109b1069020.pdfIn PDF document text
    • http://nuveclovet.xyz/13372831855zsmt6.pdfIn PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/vefisonararukivatoj.pdfIn PDF document text
    • http://newyearshop.site/college_football_championship_2019_highlightskfk7l.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/fipunu_wuxitazimifefe.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/sH4ia4r/mother_life_simulation_games_pc_no_download.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/xeselofotoz.pdfIn PDF document text
    • http://edevletorg.com/744390996185l9nt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relumewamamit.rf.gd/business_english_cambridge_book.pdfIn PDF document text
    • http://gejepif.epizy.com/wikutejema.pdfIn PDF document text
    • http://segotemit.rf.gd/4991652049.pdfIn PDF document text
    • http://legaporoki.rf.gd/how_can_you_heal_your_body.pdfIn PDF document text
    • http://kajifota.epizy.com/vamanorogemezater.pdfIn PDF document text
    • http://suvegome.epizy.com/93736232351.pdfIn PDF document text
    • http://pibekolovaxizon.epizy.com/53550197707.pdfIn PDF document text
    • http://tejejobosal.epizy.com/balizazixuzanitibalika.pdfIn PDF document text
    • http://babedetadomil.rf.gd/14143244676.pdfIn PDF document text
    • http://fobiwuna.epizy.com/bumblebee_transformers_g1.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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 5644 bytes
SHA-256: fc32cf516f37a084acdb95189506d0eb4cdb959006e99491196dd8c4da718158
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 10916 bytes
SHA-256: 2163e7d4ab7f72a51ff6163d052f05eddf4a20366c0d7ce3aa88bf2ff11b774c