Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1c3b587bca183a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 03:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 453b3684de1419846665ce37b2e6fa1f SHA-1: e96473604ece27573f62499133114647a4583e43 SHA-256: fa1c3b587bca183a77286e49a0e9096e15352c2b1c97f36fd4536bb1fa5ac4f5
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection. The presence of a 'download button' lure and a 'password-protected archive' hint suggests a phishing or social engineering attack. The document body is heavily obfuscated, but the embedded URLs point to suspicious domains, likely serving as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=how+to+recover+wifi+password+on+android+without+root PDF link annotation
    • https://grupa-energia.pl/attachments/file/zopetaralegepe.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/34521370705.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/43635057352.pdfIn PDF document text
    • http://vejwun.cz/images/daketevaritetowex.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/gesozusipidivepofod.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/malajusuteb.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908000825.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/wugemek.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/47780215093.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/32083844500.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/midikedagufokegudemobajip.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rimepavotoxebusojudiw.pdfIn PDF document text
    • http://cga82.com/admin/File/49344541978.pdfIn PDF document text
    • http://metallpress.info/files/6999215162.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/25875122420.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/30095800431.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/37152991002.pdfIn PDF document text
    • https://slotpt2.com/contents/files/94209205404.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b7fcb4a1---sigidimobakudexifikozo.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/19817636445.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/vumalejuge.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/27365988586.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/75593801869.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/58314734313.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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 17216 bytes
SHA-256: 98a4d162f34ac5a51411d67ababa6c0a84567f8fcaa5178fefb819d76a70bfcf
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10912 bytes
SHA-256: 410a93d06ee0abbdc90071c8ce93e0eac05fe996de7e94e52a2a05756605c20c