Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b8de96aea1b879…

MALICIOUS

PDF

74.9 KB Created: 2021-02-17 00:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0728d3e9e1a9970f231020bf39df83e9 SHA-1: d226cbbd4095b83b297ea39e652a23fb5990dded SHA-256: 82b8de96aea1b879aba75956921754649d78e26518f3b9a40e6046eade7478b0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing lure. The presence of embedded URLs and the 'SEO_UTM_REDIRECTOR_LINK' heuristic indicate that the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point to a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://druttle.ru/aws?utm_term=pmp+study+book+pdf PDF link annotation
    • https://cdn.sqhk.co/mudonisogub/jiiepha/color_swap_online_game.pdfIn PDF document text
    • https://tubivafidet.weebly.com/uploads/1/3/4/8/134886435/sizituzedukomif.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/hjbtthi/iphone_8_qr_code_scanner_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/9gcUgif/earthquake_today_california_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_6007a7373debe.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/qgjigha/pilotexaxekoxepuvoxem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5ff4f1bf0fd9a.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/giregononajadowezap.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/OiaLgjn/funny_talking_parrot_videos_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/gjwgegf/90893557272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5ff7c82bdf9fc.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/FfAjcvB/smash_2012_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/xRghYdJ/14544312077.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/rabujuwaburof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/simujix/gobapinefugozisujap.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/guide_de_lgistique_transposition.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/apprendre_l_allemand_cours.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/81969182820.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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5156 bytes
SHA-256: 6253fd19118673be8c4a5ba714ba3f8d8202dba8f4a8cd6346c82cb20508c3f3
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 11440 bytes
SHA-256: 94c8359be8339a450906663d2b42e670134d260cc2fa1cab576e4f12d6244bb3