Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa54fcb52548caf…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 23:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88f5d8487e993f8f900a2783ff4e5fcd SHA-1: 38d11eb6e596af1ff922d6362462be43a6988414 SHA-256: 2aa54fcb52548caf83c00d2166f7e4c6da9623cee4654a9bb1bf4cf88cb0fe6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chcial.ru/uplcv?utm_term=what+is+app+apk PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/26e9lshcphog2kihr552120sbl/96592239331.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/28210159868.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/79113591761.pdfIn PDF document text
    • https://equalland.com/uploads/File/ridifuribilesewo.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/86287685514.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/jujokavedonetub.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nipemifolekujudud.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/3815763659.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/92687853524.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109050816225475.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/23961177398.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_A2C09C01EC5F6C96.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/nulezegawusexaguj.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///99826560762.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/44805938444.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/dojasoludaxasupa.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/dinufeto.pdfIn PDF document text
    • https://htchninc.com/d/files/87985361368.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/dilosixigomowemaradeweda.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/22072271548.pdfIn PDF document text
    • http://elpijisystem.com/file/dobifuzifuvenifuwipo.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zimejuso.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8e87006f---99441299487.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/47456673133.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/sudinenez.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/bagozukimogisanizemalep.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_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 9932 bytes
SHA-256: e52d0ef41215ece5f4886aae98cd2c8e4a55cecb37b9d1b71f190c66eaf81ba1
font_02_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 15264 bytes
SHA-256: 5b72307ce69bd6b071db8fab3c6d59b61b946d85fc0e0ae95b3b857203319ce9