Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb312c1c00cdf0a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 23:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc684b8237ebc6cbf0704577ea38705c SHA-1: bf4ab03cb11e7c0cb07d9fb45ac0d738c2e98537 SHA-256: ffb312c1c00cdf0a4aaf622752ae498fac8d79d09d1046e13986af5d579f5072
166 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_CLICKFIX' heuristic indicates the document attempts social engineering by instructing the user to execute commands, likely to bypass security measures and download a secondary payload. While no scripts were directly extracted, the embedded URLs suggest a link farm designed to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://laborke.ru/uplcv?utm_term=pc+to+android+tv PDF link annotation
    • http://zulaikhatextile.com/userfiles/files/87963558995.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/54538977645.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d084e8055---kekel.pdfIn PDF document text
    • https://fratellifurloni.it/file/lotewe.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/51655748433.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/sejazafuneg.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/37996673050.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xugezijulo.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/93777478482.pdfIn PDF document text
    • http://risme.vn/files/jinopusebogikopujunaw.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/zusivoxabebapevime.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xavetesojewi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/43945935231.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jufafekosokif.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161396178269db---venesa.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/28313487652.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/jakurikidagipet.pdfIn PDF document text
    • http://hexindechem.com/upload/files/zomure.pdfIn PDF document text
    • https://podimercrm.com/img/files/bejarofob.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tilekomebafujegibo.pdfIn PDF document text
    • http://metallpress.ru/files/tumaniru.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/zevaruwelirinanebesuxu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/xuvofijasumubume.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/52523361479.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/84613182404.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 19288 bytes
SHA-256: 26f4adaab9c996e96c95770bf04e2ac52260fbc593ffc3719c229c0cf7d8d550
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 10084 bytes
SHA-256: 485e898b72fc70f4bcdc584953427ed03684f36e346a0c6c01dacb9d45bed2fa