Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc35b9b370a8a87…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 06:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b766b60639400391b1678f0048841b3a SHA-1: 81c463d7e4c9a3029fe411384884e45b33348a2f SHA-256: bdc35b9b370a8a87e612d8fd7b0437505635a3757cf6c1decd52053fe0d2fed2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which appear to be part of link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://medvor.ru/uplcv?utm_term=8+ball+pool+mod+apk+guideline+anti+ban PDF link annotation
    • https://liho.cz/UserFiles/File/45704255444.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/51570781869.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/loxizan.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/75616425457.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/4553691921.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144691bbb4c8---valufuwabafusutumer.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/zibilesexapogonafuzufinis.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/95455457135.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/163859970c3ce06ab10545dcfcb770be/11646229944.pdfIn PDF document text
    • http://ifap.it/images/file/fegapagezedivodip.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/pegutivegesedob.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/japixagenemawarozexapofu.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/16156840037.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/lofaligilupo.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/74792159235.pdfIn PDF document text
    • http://cl-pub.com/files/files/23444339751.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/buzofuzubomezijefarudiw.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/josumevupijajosevepo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/mudowikajewukad.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/6869755862.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/5510472764.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/relebokuvose.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/watugilisusu.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/20892152978.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fisafiv.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zasenezufizozewegi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/podajetasomibulabiga.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_off0000cafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 17872 bytes
SHA-256: e32c83c1f58f43faf0df5b2aecd2df462729df3f184422ea1514bed09a70ba23
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10908 bytes
SHA-256: d20192b518877d76e45492b16fe90babfda55235ec40e680a80792f96a18d9cf
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1