Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e65585897c6c67d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 06:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52a5b472b6efb7efed2f4512a7d3b61c SHA-1: eab13775faa085c672c9c4d33b4c69a9b9f17a88 SHA-256: 4e65585897c6c67da1c0de762cc564a2d0a61e9a37617ace4eee44fa408f7fbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spam campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=coc+nulls+clash+2021 PDF link annotation
    • https://horizontire.com/userfiles/file/255469102.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/52416558016.pdfIn PDF document text
    • http://land89.com/ckupload/files/81266281430.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/566014604.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/59060691830.pdfIn PDF document text
    • http://webs123.com/userfiles/file/vonowapomogasav.pdfIn PDF document text
    • https://brukspec.pl/upload/file/tibofudaxaxunotewo.pdfIn PDF document text
    • http://polletnv.be/uploads/files/29019783196.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/rafixelimemumuv.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_CBE7DCE53CF98A35.pdfIn PDF document text
    • https://felicityokolo.com/file/41123570163.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/12036166425.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/37865950982.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/79470932307.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/luveniridekaxe.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fagamevanifore.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/41805019608.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/75380595215.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/kavulugujanufar.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac31e6c19---81077772419.pdfIn PDF document text
    • https://spyboarcams.com/files/fasigatogojoperuzoj.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_off0000ae47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 10332 bytes
SHA-256: 88fc19a7f728731497c8f76757c4c50d82ee6edb36772d089550ba0260a51377
font_02_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 15496 bytes
SHA-256: 30f57389ef5ec9621c9d99cb21a1f6f038dbe926eb146368ca3516eae3b80f85

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