Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ace90c78e16f1a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 14:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d875da4f478373d64425cf5036f5ebd SHA-1: f9e95a97ffdf082e20e0f37d8a7e53801413345c SHA-256: 54ace90c78e16f1ad1bd73eb6e4e116cea1afce9403369fb269c3c64dd0124a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. One URL, https://allytemp.ru/uplcv?utm_term=network+security+key+for+hotspot+android, suggests a lure related to network security or hotspot access. The PDF structure and embedded content are consistent with a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=network+security+key+for+hotspot+android
    • http://kk-gorenjska.si/uporabnik/file/31296753777.pdf
    • http://euroear.eu/ckfinder/userfiles/files/39083782330.pdf
    • http://ozhelalikram.de/resimler/files/todanujirawoviluril.pdf
    • http://moscow-vernisage.com/files/files/tijovumuposixe.pdf
    • https://drticket.ir/basefile/drtiketcom/files/fanekefegino.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323965df3a5---2817564433.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/31977489141.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/84081811946.pdf
    • http://mrhobbscoffee.com/images/uploads/file/9267800469.pdf
    • http://phantasos.org/userfiles/file/26358415512.pdf
    • http://raylutickenterprises.com/userfiles/files/pijosigoxale.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/37974270200.pdf
    • http://zerosquareonline.com/file/64639304817.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/voxasiravas.pdf
    • https://pamukoglu.com/userfiles/file/69440133821.pdf
    • https://promobryansk.ru/userfiles/files/kederagajenorilin.pdf
    • http://pure-chiral.com/upload/files/lotiroge.pdf
    • http://kedehg.com/ckfinder/userfiles/files/10987950573.pdf
    • https://imagebeaute.fr/userfiles/file/digulip.pdf
    • http://nfrostov.ru/upload/files/91717145780.pdf
    • http://meimagedance.tw/ufiles/files/41259446415.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/4608708630.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa60e31e4---panumawiwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ba.bin
9612410285b85ace93dcf419cd9946efcf122e663025dbb374af8493bdaae5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 18212 bytes
font_01_sfnt_off000116a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16792 bytes
font_02_sfnt_off00012ebd.bin
592400897b40c3457c6a879e2626c447b67b39a7c5b2f3d13afa1590ef6b8279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 11040 bytes

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