Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c7df67ee48fc53…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 06:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ca5d1e178fd6e00a833955d9b08e297 SHA-1: 24b686b6378f178c54d98fcd73d8de2bd9a5ac9b SHA-256: 80c7df67ee48fc534ab039c38d2faf9ec6557441d1e872ede4aaffbdc50bbce3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=putlocker+love+island PDF link annotation
    • https://tekartltd.com/upload/files/tajukubir.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/zogesesoxexepe.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/19945873782.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/merisajavamer.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bb82f4d048e2c80a0019272f3368c48a/14069063218.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/tokumibuwunafewo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/62872328457.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/pezonuvizitunezulov.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210918115615292746454.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/82544977212.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/458306817.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/77442736584.pdfIn PDF document text
    • http://clingac.es/d/files/32640756801.pdfIn PDF document text
    • http://floramarble.com/uploads/jozalisa.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/70857979240.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/51089583635.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/50139818711.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/99001833616.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/45619163345.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kefuvutalotarekobojimal.pdfIn PDF document text
    • http://orenprom.com/img/account/file/xozoverodotefat.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144acb6820a3---wapaxopawidozefekaxakukur.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/tomunopijas.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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 18480 bytes
SHA-256: b65ec471bb3dab717f0dd68a3599506328d04a2b02ae0f27604bbb6327a3ea1c
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10620 bytes
SHA-256: 97a8536d8deb91220d140481ecb8566153c5965ef1857876ef369d71fd0da715

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