Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b26ec7be318246…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 01:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9140871cc50b84700661adb6259e4460 SHA-1: d2fd94a5f8b2411598e3703b9e37861aebabea45 SHA-256: 51b26ec7be3182463dc39f67ec1e1fa0dcb80710e6b7e0530114d8fc469bc1eb
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution scheme disguised as educational material. The ClamAV detection further supports its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/wix?keyword=energy+conservation+worksheet+middle+school PDF link annotation
    • https://s3.amazonaws.com/zarelusipofox/boboiboy_galaxy_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/peposusuwi/mjahb6l/32569795391.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/93271414201.pdfIn PDF document text
    • https://lomapasaxanigef.weebly.com/uploads/1/3/1/1/131164081/motiputelejej.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/87484878385.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/agyo_privacy.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/puxovilosem-polidazosisel.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/wodimenugenuxebuwivoli.pdfIn PDF document text
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/soketotitiwafezegin.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/ledabogizarufuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/32027111971.pdfIn PDF document text
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/2298999.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/all_in_one_old_games_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/65957181437.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/Dggheic/tibotitujegesuvewubodi.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/dekurikezenikam.pdfIn PDF document text
    • http://nasumowuvajoda.iblogger.org/biology_multiple_choice_questions_download.pdfIn PDF document text
    • http://pejibapu.iblogger.org/el_llano_en_llamas_cuentos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danobefaxejo.rf.gd/lazak.pdfIn PDF document text
    • http://jekidosokun.epizy.com/emirates_airlines_male_cabin_crew_uniform.pdfIn PDF document text
    • http://pifajizimaguda.rf.gd/5e_acquisitions_incorporated_download.pdfIn PDF document text
    • http://mogerokefo.epizy.com/69180033880.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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5628 bytes
SHA-256: baae395fb8379e141b1377359d341d535b78e1230377f35f98ff6af446cfd39d
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10580 bytes
SHA-256: 8ae8b81aa4ab7c913a37d2ffb063901708c4789e7fff7a61c1b266bbb5d83d90