Malicious PDF — malware analysis report

Static analysis result for SHA-256 164cc07cde701fa0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 16:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 372e8bc065ace8b320afddaed616ff4e SHA-1: 00a04d96e9cdb43949fd8d78b49fcb867decb715 SHA-256: 164cc07cde701fa0a136300b636348d95babf8a104db3e6f64a2b256a1e77637
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a deceptive workflow. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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 http://yoga-privates.com/yoga-privates/file/96699331247.pdf In PDF document text
    • http://thamcohoaian.com/webroot/img/files/91419972555.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/zozofip.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/sorajiri.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/kononerunu.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/37818994025.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/74524351895.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/91591058339.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/25691871072.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/gunidaxuvatefume.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/37922871766.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/minunavonejenabozetovidak.pdfIn PDF document text
    • http://xhzhengli.com/upload/87439511981.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/80702181131.pdfIn PDF document text
    • http://sjhtractor.com/d/files/15663733376.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/41681723996.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/pemomivimitanopupivewatul.pdfIn PDF document text
    • http://elma1.ru/!upload/files/nivubidavimi.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/logazuxupabive.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/pufuniraxi.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/lewenupipudeti.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c3f69b18---seziwizikozizogadonu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/famapudalerofatoromarosog.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139b84abaa9d---jatuv.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091602341070554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=picsart+mod+apk+2018PDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 10988 bytes
SHA-256: 69a23caae35a51a92964d1493f6cd018cc9000c1752d4f9cf3f1acfc261577c9
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 19644 bytes
SHA-256: ee2bb8b856456319368588c1a467eb5f728c56d5ff8ccea18e0581999b97b386
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1