Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ce008ea4efc0df…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 22:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 182220fa99a4cdda092f51d62eecfd36 SHA-1: 7ad4b703161caa054fdbdd947e3e55f5072b9bfc SHA-256: 85ce008ea4efc0dfa5a9c038c8b7d8b3d0e02e700e1fbd90ca26961ba795137c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://flagrant-desir.com/userfiles/file/11005149665.pdf In PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nalubejepiwikapu.pdfIn PDF document text
    • http://armanetti.com/images/rodigi.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/98719293427.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fewiweruxepobanetulagux.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/67423895415.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613673a7b0a34---vaxepipagiposupif.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rexatugalametalu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/3286912207.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nosipinu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/16202510014.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020553021572.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6iho07flds1nftrvuescqeidfb/7614532580.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/9134113309.pdfIn PDF document text
    • http://masonhn.com/d/files/730044695.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/siruzim.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///22022518650.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/bobosulalilarinuno.pdfIn PDF document text
    • http://topflexsports.com/uploads/34072216582.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/51622956145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=internal+parts+of+stomachPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_01_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 10604 bytes
SHA-256: f9994a701d6326f2ab8c4b2a06a65403dc4eb26a3e6422cc769e5a4e0dbac19c
font_02_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16112 bytes
SHA-256: 6f972c3335720a108e72ebd59ffb94208b75d2b208d059b0fa54307a1f02a51f
font_03_sfnt_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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