Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c741eb8fcea19e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 09:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1337b0efbf2aba57bbc0a6701e93ff04 SHA-1: 8aa8cd8dfb94bd3fcc4ee75378eb7c7119de3506 SHA-256: 48c741eb8fcea19ecf10c42fbe03c0157d1e839f024f1dec0f5d961609fc2425
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=watch+fight+club+online+123movies PDF link annotation
    • https://yukkumpulgroup1.com/contents/files/45584825461.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/pesanogimaxifiguji.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/semapefodevimivalewej.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/43117577603.pdfIn PDF document text
    • http://qwerty.pl/_data/file/35943439950.pdfIn PDF document text
    • http://mqskin.com/luutru/files/88677364391.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/56834061600.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/fowovoregiluwolukige.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/lotitakovama.pdfIn PDF document text
    • http://ladna.pl/user_images/file/64879740415.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/tuzete.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/98324410661.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/43714447729.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/komapiziwujugunotenoxobof.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/44043583475.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/gesusaraxu.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/gutidamez.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/jelalapixokefuvedikaxunes.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/bamawubomapimosubu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/98794896429.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/bolel.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/47193773138.pdfIn PDF document text
    • https://quote-supermarket.com/userfiles/file/leruwizufuzawakinin.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/23111838029.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 17872 bytes
SHA-256: ea703d4a177afe0e1ad2bc52490d4bee0a6a50d1410ae02dd8843b6a687b8ba1
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 11328 bytes
SHA-256: 429d2212201f665c1d8bfbd8f2fea1a2293a30d1beea5ed30f25240e8835b187
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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