Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1db904f11d10938…

MALICIOUS

PDF

80.7 KB Created: 2021-03-25 09:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 491cd6d6d54ffabb4422c76155bfd561 SHA-1: d2c5e6902be3f8c05ad61c86cda14111886c3b91 SHA-256: d1db904f11d109383c03fed8378c9993d968091676f3a48516a75577c9bd70cd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL identified is https://jacksth.ru/strik?utm_term=how+to+start+a+high+school+application+essay, which is likely part of a scheme to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=how+to+start+a+high+school+application+essay PDF link annotation
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/finupab.pdfIn PDF document text
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/wopinuwabobopen.pdfIn PDF document text
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/a09f8f1c9.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/vukozudowur.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/7bRdgre/assoluto_racing_drift_mod_apk.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/apertura_de_credito.pdfIn PDF document text
    • https://cdn.sqhk.co/japanakoga/sifdMhc/41762073224.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/hb9ihUH/weforimesepuzurexuteli.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/i8hcjjq/zuduzuxoloxu.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/937cc190c0f90.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/48825e1f-dd40-49f8-be2f-b6b001f55671/pronunciacion_de_verbos_regulares_en_ingles_d_t_id_lista.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/types_of_exercises_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525167b1-82d1-47e6-ad8e-9c447a39c386/skyline_layton_travel_trailer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e885258-d7cb-47e4-a622-3f6d1f4a0467/how_to_tell_how_old_a_club_car_golf_cart_is.pdfIn PDF document text
    • http://zezewesiwakoruw.rf.gd/70612566141.pdfIn PDF document text
    • http://sefatefa.epizy.com/wosexijivil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dba43de-3848-4aeb-baa3-5345d3b4f92b/52938553842.pdfIn PDF document text
    • http://fubegamo.epizy.com/pajadabinotozagema.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 5352 bytes
SHA-256: 452ce0ec8fda2176c8435ca0abba28a869bb887d02839cd154f3e218fe4fca56
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10816 bytes
SHA-256: ef72db68d6c2a3f42d95074ef92d8e4397c96cd3ee0eb6ba0b03b9a95999ecbd

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