Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36f33ad8d2aa005…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 11:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b285967cc1e21dbd974ec586a4ec41b6 SHA-1: e02ac584c4b5ae19bc4fc1c52d789d8ea05fd1b1 SHA-256: c36f33ad8d2aa0058805a1cdb8cf12aacf4882d9be15efc9cc589af0651f50c5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful content.

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://jumiwimov.ru/123?utm_term=dc+dmv+test+answers
    • http://famozosivupiwij.sportsontheweb.net/learn_english_online_free_usa.pdf
    • http://lowufadit.scienceontheweb.net/metric_standard_bolt_sizes.pdf
    • http://junumidutuzakox.getenjoyment.net/tagafijezenujokelij.pdf
    • https://bikuxemigoveju.weebly.com/uploads/1/3/4/3/134373773/rubajafinedi.pdf
    • http://baderezu.scienceontheweb.net/nepevijuvaboguwaboxa.pdf
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/paven-duwumorotamo-mifix.pdf
    • http://medemukiduba.sportsontheweb.net/lubudelukififiginenamonad.pdf
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/52997541c.pdf
    • http://liwitesuzemumex.sportsontheweb.net/73727789585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_f75a67a11d5d40c798c0e78f34575325.pdf?index=true
    • http://gepuxaxevo.rf.gd/animations_app_for_android.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_5afcf111f1fb4036bd5dc7254d92be48.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_7fd95c34594e4d569d9b286a146eb050.pdf?index=true
    • http://geboxopok.rf.gd/33367521272.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_37d7b94a34e44bbbbed2bc62ad540788.pdf?index=true
    • http://vefodipox.myartsonline.com/separation_process_principles_download.pdf
    • http://wisakixatepifu.epizy.com/vizubapudonugurakuwolino.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_63e27fbf9751404f9f305634a7689632.pdf?index=true
    • http://xanagenijumujoz.epizy.com/what_is_a_4_piston_caliper.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8a.bin
e343afc2ff68838d2d83f53aa3f33318bc251c26058382efd4d7cb4bbada23ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 5204 bytes
font_01_sfnt_off00010f3f.bin
53f4dac5e950f4bba612caaa688ea1cc8d4eaf316d862be2b07cfa99866ffa28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 11168 bytes

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