Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9af81002e635560…

MALICIOUS

PDF

85.7 KB Created: 2021-03-27 23:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 90511234322a21ce25c166ea36761d09 SHA-1: 56010f2c4ddd6fb6e8f10bd5863040792f86784d SHA-256: e9af81002e635560606ddff35655d260e5c755e5f577d9bafd62e9dc3a691337
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'sentry safe code'. The presence of numerous links on disposable hosting further indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+to+get+sentry+safe+code In PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/lojafabelelalaw-dovogakatev.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/xchbXNG/11421276296.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/mUrgdja/vuwije.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/fufumuxadisatuj.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/17109412f7.pdfIn PDF document text
    • http://bixuvukulizolu.22web.org/zavovozoritujopasex.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/stay_with_me_sam_smith_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/hgjjjjW/democracy_women_s_plus_size_jeans.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/ae3df125f5.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/5071656.pdfIn PDF document text
    • http://segewagukejij.iblogger.org/sogadopipa.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/2980526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waxozex.epizy.com/mbbs_cardiology_books.pdfIn PDF document text
    • http://razogop.epizy.com/zosoganabuv.pdfIn PDF document text
    • http://lozabozirazal.rf.gd/telugu_calendar_september_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/keys_to_drawing_bert_dodson_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/what_is_a_developmental_milestones_questionnaire.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/34877145134.pdfIn PDF document text
    • http://xizesewidepo.epizy.com/7243682083.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 5312 bytes
SHA-256: 9f45e17fcee047d39ca3a8ad3afe54dcd2d9fec43ce192ff3eb05288310701ed
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 2320 bytes
SHA-256: 46c5071ad850445f02c3b0b61d0099e72074956b6f3e476f96c3288e41c73e43
font_02_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 12144 bytes
SHA-256: 4477519561631d94fa4fa74aad22ce3e830de24c8003640002934013d5b5b726
font_03_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 17040 bytes
SHA-256: 9f4e84f3e6713158b8f23e6cdf4816993d3597c083d3bec3f1303b48f3ac4b6c

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