Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8841f7d487f58c1…

MALICIOUS

PDF

73.6 KB Created: 2021-03-18 02:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 017db9479502866641a7da6171709a17 SHA-1: 91722646e29e605ee4565bd75f189cebc41d1dd7 SHA-256: b8841f7d487f58c1ffb061adf15fc153bdcf09da6841f06e3d34f08d25babfef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files on various domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://fokemale.ru/award?keyword=ielts+vocabulary+list+for+writing+task+2+pdf PDF link annotation
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/gifazojul-wupejoz-nedep-nerigenivonijo.pdfIn PDF document text
    • http://natalonofawoba.22web.org/does_bullseye_trades_work.pdfIn PDF document text
    • http://jovaguduretup.22web.org/24117764112.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/47cd861.pdfIn PDF document text
    • https://nonemofolovexuv.weebly.com/uploads/1/3/0/8/130874593/wiwete_loguvakid.pdfIn PDF document text
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/494b9f72360.pdfIn PDF document text
    • https://xidatajabo.weebly.com/uploads/1/3/4/3/134375349/fdf83.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/third_abcd_letters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavatesivo.myartsonline.com/mofowuzosijuza.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/34036541175.pdfIn PDF document text
    • http://gafodix.myartsonline.com/how_to_give_a_compelling_interview_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/12820006300.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/webafirotarepeni.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/73193860994.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/wefesulifuputurimizodas.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/zarojutapedusulijeduz.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_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 5848 bytes
SHA-256: 920480d6ee3560e9e2a645d74916c56b0b2fa8058235e7dc86ad181ba74ea6ad
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 11068 bytes
SHA-256: 6fb113c0d2d4a4ff8aba80278b50caf2f9676f7768c06f0549a8aef3ede42586

Open this report in the interactive analyzer, or submit your own file for analysis.