Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829896cb8818928…

MALICIOUS

PDF

85.2 KB Created: 2021-03-19 12:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f34561165e02fbf7d44bc822d0c08c1f SHA-1: 3449ed9bbf79ac59bbbd46c1b1743c7bcbe805f4 SHA-256: e829896cb8818928988d1d60863f0c5296e1915c49693d6674b76c552539f7a1
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to 'Error tipo 1 ejemplos' and references wkhtmltopdf, suggesting a deceptive lure. The presence of numerous links to potentially disposable domains indicates an attempt to redirect users to malicious 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://jacksth.ru/strik?utm_term=error+tipo+1+ejemplos PDF link annotation
    • http://1xbet-regi.site/magokagowij5vonb.pdfIn PDF document text
    • http://fastpysystem.online/what_kind_of_yarn_do_i_need_to_make_a_chunky_blanketnglm3.pdfIn PDF document text
    • http://1offpark.xyz/lurujokarasukofutototarofy9qg.pdfIn PDF document text
    • http://plsale.pro/zadevetafufilavf9y0d.pdfIn PDF document text
    • http://freshnatur.fun/arcadian_war_turtle_guide4zkay.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/jobexi.pdfIn PDF document text
    • http://disconto50.pro/266880718862mtb0.pdfIn PDF document text
    • http://remontnatali.ru/43064259141prd7j.pdfIn PDF document text
    • http://eslife.pro/anti_terrorism_shooter_hack_gameah9yu.pdfIn PDF document text
    • https://duxojavuse.weebly.com/uploads/1/3/1/4/131483254/4858143.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/how_to_order_bob_evans_thanksgiving_dinnerc4vl2.pdfIn PDF document text
    • http://mnogoturov.com/what_to_bring_to_car_inspection_ny5x3o0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d029141-0982-4700-9bf7-97ba445c6538/why_does_my_lg_refrigerator_ice_maker_keep_freezing_up.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/zatejapuwolaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1371a25c-42be-4faa-bf31-bb545f17b4f2/woruxisapopewanisuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/almacenamiento_secundario_definicion_en_informatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17bf0d6-4705-4492-b18a-213e723349f3/asmaul_husnah_dan_artinya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9f6658-2b3b-4931-88fd-f027beb052fa/best_5_minute_stretch_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27529eeb-2d3c-448d-ae82-896517e4864d/wusevumaxarurulelim.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 4840 bytes
SHA-256: 0a0a20ed3f9e311fe778399957d4b09b92ef91f7cadd31884d4f889c9675d24a
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 13556 bytes
SHA-256: d112e61ede26006b2c6403829f7922f8a356a20f03f830b3ea3fabf7e7371194
font_02_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 16208 bytes
SHA-256: cd24fd219253d520e42d97086efbcbd324ca96e25bcc4d23f416e9ab54c05ec1