Malicious PDF — malware analysis report

Static analysis result for SHA-256 157cfb4f091f278b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 13:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5777f60eb28d35c0b1bdfc1d8edba2d7 SHA-1: a0175ccffd9661512c6ac4dc0158075b9620e011 SHA-256: 157cfb4f091f278b7ed4e6b7c16353bad8d476ecf8a1abf3267f838d7fefc344
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/97iu7gumlf77f0rc238n8h7da5/luzajasedilovizivobomasaj.pdf
    • https://pindimana.in/uploads/file/96077829039.pdf
    • http://vevo.keresztessyoptika.hu/elemek/file/39318252905.pdf
    • https://tasleemdubai.com/userfiles/files/bukekoridilosadizizaga.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4f492a3614458f16ab05a5d987edda1/tusefuvubuzediwuzomavaga.pdf
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/fuzovajebalis.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/japegafelezekijefoduxis.pdf
    • http://ktai.lmg.jp/upload/file/56705742493.pdf
    • https://portofcrotone.com/dati/upload/file/31513342835.pdf
    • http://inspiredindianfoundation.org/uploads/23751613765.pdf
    • http://www.zywawiara.pl/pliki/foposepotesopaz.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/75439163885.pdf
    • http://eg-connect.com/uploads/editorfiles/file///57329502942.pdf
    • https://rsvforum.com/userfiles/file/59524086149.pdf
    • http://darstin.com/userfiles/files/89278088019.pdf
    • http://mtt-association.fr/upload/file/julowupikurenorijad.pdf
    • https://gedayapi.com/userfiles/file/zekoduzujezuzowib.pdf
    • https://fokusmedia.com/images/uploads/74855702282.pdf
    • http://munnartourism.com/uploads/file/36139908092.pdf
    • http://phuocthuan.vn/images/pic/file/xewutitija.pdf
    • https://bbox.ru/images/shared/file/bebipifaroxefi.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090514551673499.pdf
    • http://exmar.it/foto_fck/file/fudenusol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+11+pro+price+in+bangladesh+256gb
    • 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_off0000d796.bin
a551a1bdf388b8d6e56f83f6be2d73da0378d8e91fcef06347d9325b7735bd59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 18724 bytes
font_01_sfnt_off0001088f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16792 bytes
font_02_sfnt_off000120a6.bin
2cac03f620f0fe2bce739c5c3f377389fabc06c01d85f33517f3f03dbd38ecf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 11260 bytes

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