Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f307894add82fb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 20:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18dc87396bf8d32b692648378bd0c22e SHA-1: ba4a07879c7696141ae1e30e3459b06f187b6169 SHA-256: d8f307894add82fba350506a02751b483e478704c464e11e70399e1bbc2ccf74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to disposable hosting sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6d301524---41040230239.pdf In PDF document text
    • http://onlinevay.com/upload/files/2818311726.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913151354.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/vafojuj.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zokonoropofekumidi.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/mipebateni.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/76567085735.pdfIn PDF document text
    • https://motoralbini.it/files/file/48265578714.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/88317190908.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/tagenozi.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/dedowaw.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/benipawedibijirepugobid.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/53938687656.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/40684725130.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed586f890---miweg.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/82565827848.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/tekajasebigitekukisono.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-8/20210908072141684753.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219141925117993.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/73661101144.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210906124736.pdfIn PDF document text
    • http://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/71566352235.pdfIn PDF document text
    • http://swhos.com/upload/files/xemupivosolefux.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/mekatutomij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=justice+league+doom+full+movie+onlinePDF 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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10876 bytes
SHA-256: 60b66c8ceb6f2378765401247691163e0455997526059ce6ce3b4dd66d466adf
font_02_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 18472 bytes
SHA-256: b7921d4e51d89584e1668b442b0a818a82d53e625677ad78d7311d31a84c8c2a