Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2716bc8983de57f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 17:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 556ec96391325538aa16213b21a81f2e SHA-1: 675259a4be72a5b1c602ca8f58f21c37e61afd80 SHA-256: d2716bc8983de57ff2023e60a524ff31a1a3c346b5c07af56837607ee2bf36f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs point to potentially malicious or suspicious domains, reinforcing the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://101doctor.com/uploads/ckfiles/files/6139e318b2097.pdf In PDF document text
    • http://tsnpharma.com/upload/files/vogugarumumoruratuwomak.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/kemaxibexodojanim.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d990b032a6d755aa07159fc2f2a2e636/25031957347.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/rafenilupezuri.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/dugubosegukafepu.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/24755252091.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/39777716969.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145254ad4ff0---47837500981.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dawubenurodi.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/zukebixagusumagazojavusev.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/63643383024.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fesajakefigodazif.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/lovetijul.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/ligesiferule.pdfIn PDF document text
    • http://exosushi.com/uploads/files/31373603164.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/94997845372.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/38319566335.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/bazumarosovuwe.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/99169013394.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/kiloxizililigogefove.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/maluvilobimikom.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/pomujanigelinajedagibu.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/nakitezonovenegog.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/gexujenetamamovujinituk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+san+andreas+ultra+graphics+mod+download+androidPDF 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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 15104 bytes
SHA-256: e2f4386c5ae087b919850989ecc72f80d14460dfbe88862b4e291bfa8f34681f
font_02_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 11188 bytes
SHA-256: 4687a1267fad58058ef2170a62de88777f7b772f6ff10f710d3da6322c77d5c9