Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ae5c2fb861e10a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 03:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40da13bbdb64e014ada541a57fb984e1 SHA-1: 411922f91fae6c277450a859a9d9e90e89ad6f24 SHA-256: c7ae5c2fb861e10a52af39696778700434568bedf9555062e271d7d867d8c489
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests the document's primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://rracc.com/file_media/file_image/file/wawolekebetofogax.pdf In PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/56049022383.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090613342073499.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/eed75b8383a97f2fc19d7c96aaf6555b/wowilupibukozupu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/romuroxigagiwetose.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dasopirigob.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/karese.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/setus.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/44138848114.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/totajig.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/45973444497.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/kemozevimulatolabezuj.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109081123061740.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/wudowisujarowu.pdfIn PDF document text
    • http://sptcrane.cn/d/files/fewumoranuruxiluzetotub.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/kuluxanidiluturisasume.pdfIn PDF document text
    • https://nexapos.com/upload/files/29296559372.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109230151242858.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/53836600556.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9b548e4705c66d75d5561e1f8b998545/dugunigojoguduxovajamipif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+camera+effects+app+for+androidPDF 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_off0000b87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87D 17464 bytes
SHA-256: 8d54265e895a42c862127b84dd1bc7fc28687d9132d6c7fdde3d7ea9f950ae00
font_01_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10788 bytes
SHA-256: 6b00daab362be4d0749b83e8bdb0ffa1ffe6f072c903a490f4f7a4b10288fda3

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