Malicious PDF — malware analysis report

Static analysis result for SHA-256 685420ea682f3869…

MALICIOUS

PDF

84.9 KB Created: 2021-02-28 09:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e493bdd64549df1ee0e9e235804e163 SHA-1: 5cf76bb342e8cd120e5e5062fac3f85ffd19104a SHA-256: 685420ea682f38693cb6fc5b924806f7ee595be053715f5d5f9d2935f99fb3d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be related to printer reset instructions, a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=hp+1606dn+reset+to+default
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/wasarotede.pdf
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/3cd5dbaff.pdf
    • http://rumurel.mywebcommunity.org/iste_standards_for_students_and_educators.pdf
    • http://bobr.space/atharvashirsha_lyrics_in_marathismvz2.pdf
    • http://olx-delivery.cc/troy_bilt_flex_mower_blade_replacement6xykn.pdf
    • http://mufutekuson.getenjoyment.net/zejaki.pdf
    • https://cdn-cms.f-static.net/uploads/4449599/normal_60109fc12abe0.pdf
    • http://gemubanabugawa.mypressonline.com/best_book_for_gate_mechanical_engineering_2020.pdf
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/4307246.pdf
    • http://mojadejazisapa.sportsontheweb.net/crossfire_series_sylvia_day.pdf
    • http://lokubakodo.getenjoyment.net/89997602956.pdf
    • https://static.s123-cdn-static.com/uploads/4424007/normal_600345657b8ca.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_601dbdb9110b2.pdf
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5fe3501602c2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://zogosugo.onlinewebshop.net/duruziki.pdf
    • http://wotidupodugi.myartsonline.com/zenaxoligekusa.pdf
    • http://fujukosis.epizy.com/43231095703.pdf
    • http://xijodakofifo.epizy.com/cosecha_robada_vandana_shiva_gratis.pdf
    • http://bizsupport1.austin.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&t
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://bizsupport1.austin.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&t
    • 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://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc88.bin
5b458fe445d8d1c9d368a3af105480d874bbd8307b856ab2f072f7217648d121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 5344 bytes
font_01_sfnt_off00010ebe.bin
48ec264e9f915751dcbb29a8578c6253b1f1f36b40c5c4c89f29440e9f044839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 6576 bytes
font_02_sfnt_off00012049.bin
3c075c7dcfeb0e2caa4dc77565667bfe0d4b1eeddd8407f814eda730bc52d02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 11076 bytes

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