PDF malware analysis — malicious · e92d8661419b5baf

MALICIOUS

PDF

91.6 KB Created: 2021-03-19 18:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 7cc1cb6527f059dafc16eb99900d60ff SHA-1: 7783df88884d34824ea27188ad23a76ad51da58e SHA-256: e92d8661419b5bafcc35b13176f3f9f00d9f9bd5d699782b87936d480e7b8b63

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a worksheet and mask its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://seumenha.ru/wix?keyword=pascal%2527s+triangle+coloring+worksheet
- http://jivavesomuviz.getenjoyment.net/30555440717.pdf
- https://cdn-cms.f-static.net/uploads/4463803/normal_5fda59a8ed560.pdf
- http://denizan.com/307499589506fsrz.pdf
- http://xubanapirobula.mypressonline.com/livro_raizes_do_brasil.pdf
- http://gejesixave.scienceontheweb.net/how_much_does_a_nutritionist_make_a_year_in_canada.pdf
- http://storeyou.store/how_to_crossfit_at_homex01co.pdf
- http://xufuxenu.mypressonline.com/volume_of_cone_worksheet_grade_6.pdf
- https://cdn-cms.f-static.net/uploads/4494149/normal_602685185f813.pdf
- https://cdn-cms.f-static.net/uploads/4454047/normal_601f6713812d3.pdf
- https://static.s123-cdn-static.com/uploads/4448984/normal_5fcf0c9729fd0.pdf
- http://wubujonil.getenjoyment.net/6.0_powerstroke_kc_turbo_rebuild_kit.pdf
- http://lenusabipowezo.getenjoyment.net/17655938863.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://www.daltonmaag.com/
- http://fejonaxi.myartsonline.com/mafivituguniwukezekasew.pdf
- https://s3.amazonaws.com/tezude/allied_races_wow_guide.pdf
- https://uploads.strikinglycdn.com/files/fea4b369-679c-4e7b-a3c1-b1d188785096/meek_mill_book.pdf
- https://s3.amazonaws.com/zedilegol/23513743516.pdf
- http://lelikerakovet.atwebpages.com/lemomijijadetiwu.pdf
- https://s3.amazonaws.com/zerepuzuze/letter_d_worksheets.pdf
- http://xufoziminep.onlinewebshop.net/free_autobiography_of_a_yogi.pdf
- http://wejajesenopezoj.onlinewebshop.net/51076526410.pdf
- https://uploads.strikinglycdn.com/files/ed5b6fcd-6db4-4077-bc22-835f3452904f/jederavajasenonu.pdf
- https://uploads.strikinglycdn.com/files/4bed5bb6-2587-4ca4-9c20-8d297a99d7c8/rakegijasogisonuvudeve.pdf
- https://s3.amazonaws.com/wupuxus/revista_natura_ciclo_9_2018.pdf
- https://uploads.strikinglycdn.com/files/986ac8d1-985f-432b-ba6f-cb6ed5595450/nelirufiga.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/
- https://savannah.gnu.org/projects/freefont/
- http://www.gnu.org/licenses/
- http://www.gnu.org/copyleft/gpl.html
- http://scripts.sil.org/OFL
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f6e4.bin` `705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6E4	6440 bytes
`font_01_sfnt_off000106d8.bin` `d6d1e3c91b1dc6f6930e995ed1cd20f2772ea891dd02a1421609c9faaac3220f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106D8	5040 bytes
`font_02_sfnt_off000117fd.bin` `bd1acec3a03e1e3ba46b63a23578cf82ef43f6ae0c906c74fea6c5b53c825e96`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117FD	10516 bytes
`font_03_sfnt_off00013c52.bin` `2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C52	16092 bytes
`font_04_sfnt_off00015118.bin` `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15118	4324 bytes

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