Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81e903cdac2c121…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ce718316b6617e4caccb5731c40d8ee SHA-1: cd02d65bdd2bb3850d84bc970eafb715ddabcb42 SHA-256: d81e903cdac2c1214e96132b8527b8dc8fbe251a8971a21329a25f97a6b842b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and UTM parameters further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=free+photo+editor+for+windows+10 PDF link annotation
    • https://membermimpi.com/contents/files/72765001829.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nobasizabokomigolebesoped.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/netibuzuzorofafewigixuf.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xakevomado.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210906134422.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/94032346672.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/95491190465.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/68428844019.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/jiwaxodobowivetulupape.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/wunumifes.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/68484322507.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxisekefira.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/newigepibubaruv.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nifisuzimufoxujatexomeves.pdfIn PDF document text
    • http://creationart.hu/files/file/73995847971.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gekilexatanagas.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/werisukijewakogupitoraviz.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/fapetokasomenadura.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/68540987683.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/45175142448.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/36062935985.pdfIn PDF document text
    • https://educhina.mn/editor/files/janilit.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/33263567244.pdfIn PDF document text
    • https://vpmemorial.net/images/file/4078432758.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_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 17800 bytes
SHA-256: 8f3a17e0f5fe11ead22261dfdd8db301b60e78e372c7a54cbec975e91e91866a
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 10624 bytes
SHA-256: 139c68365a25994d686a8989347148e6f678c7d6168bd5683e7b133337fc4b72

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