Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f84aa3b1cd7b9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 05:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ed95384ba476be16f0a5f85945ec2ce SHA-1: 79f0473fca0b1926a00493723d3b2b5041534012 SHA-256: 883f84aa3b1cd7b9138bee654e5e8043cd326e0c18e0e9f9162c64fa59179bbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to redirect users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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 http://efuturesthai.com/uploads/file/zaximexujeb.pdf In PDF document text
    • https://tsydesign.com/userfiles/jws/files/58238232335.pdfIn PDF document text
    • http://haphadoor.com/upload/files/54882775136.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/21568479958.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/gofolefuwafekuwipibapel.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/tedifoxezo.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/59618710199.pdfIn PDF document text
    • http://willbramephotography.com/nabopevibajodirukomi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/55877225631.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/78522951718.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/10056555938.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xetatisanasowi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8a91c2e3---rixaduruvufowivunenuk.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/90737014577.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/lunaxafewejuwiwepovexe.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/16407655346.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b04b8e7467bfcd2f45124f33f6aa807a/54108995178.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/tajodonogisutonovato.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/rixarajugijomizedun.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/67993300700.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zuwiwiwixejapulawop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=living+history+book+pdfPDF link annotation
    • 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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16788 bytes
SHA-256: f43919d34d09f0778402b70aa9d18bae0d091736d4c62061767ab5276c8758ce
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 10808 bytes
SHA-256: 03bb45a33d96a966d57e9cd4ddd0e178c0195677f5aa76e4b577d21112f8f444

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