Malicious PDF — malware analysis report

Static analysis result for SHA-256 55883b87ea01d60a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 01:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb7ca22f4d9be7c1a62e4cb80ad97a4d SHA-1: e643ee7fb501b33460c9c77deda95a20633d8c46 SHA-256: 55883b87ea01d60a70cbe4168451a281f451cca022704e7e96878c7647958d29
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://snailgame.ru/upload/files/20210901223816.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/masitulogusabexizatatu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/13406484200.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/18952220385.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zalirejezugo.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fiwinigalomosadetetej.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/fipomuzunagarupagamumi.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/5277513006.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/95724898562.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jogudesoxabowabaj.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/wapepubipimofu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6d1923ac---47077803208.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/livipisibuses.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210907_73866E5C3505F75B.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sewoso.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/sijixujirujezidop.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/visumesikezekofavot.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/46102810566.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/rutixavububitudawova.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/28799939804.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/bafewawik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+enable+auto+start+apps+in+android+11PDF 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_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 17144 bytes
SHA-256: 8e557184f0c012aff3e80c5c915ea11d0520ea791af9fa72b164e342a0e6095a
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 10756 bytes
SHA-256: c89f1914b0dc09daf45b553853eebf0bcb07ead213587f0319af007bce84b882
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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