Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c157f53fcc53af2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-02 17:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef4291789aab064ea464a800abd07230 SHA-1: 277135f460e58475d50e3b045362aa6096874840 SHA-256: 1c157f53fcc53af239985b17659b70b2213c2b81ea5d70c6b43eedaf6b4408fc
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://maypoin.ru/strik?utm_term=how+to+play+cut+throat+cricket+darts PDF link annotation
    • http://creditscorecard.info/dezal9uf9g.pdfIn PDF document text
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/66d5ea594d.pdfIn PDF document text
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/mirerorasoxuwef.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/ighgjep/21823701833.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/ggiiuPe/dinghy_davits_systems.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/xunuzuwenud.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/2388cb8.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/44e592512.pdfIn PDF document text
    • https://kimodoximotoden.weebly.com/uploads/1/3/1/8/131856266/49ccab372539ae.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxumisi/4ggg5jf/fios_tv_app_guide_not_working.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/tipos_de_electrodosot4ak.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ifgoHbj/hmrc_contact_phone_number_paye.pdfIn PDF document text
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/wadipevawiba-lowibetu-penowazakafov.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/5hiHhiB/ludo_superstar_pro_apk.pdfIn PDF document text
    • http://abanca-electronica.com/bikizxripx.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/hbiicjd/difabadise.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/giyWDNf/53037396644.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixapudel/jVhNjaq/zombs_battle_royale_apk_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/86124220696.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/memufokata.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5156 bytes
SHA-256: f709b5b001728de79e6c06212678db57d7625865690ee73ce2386918082c44d0
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10256 bytes
SHA-256: dadb174a65e8a4433b4628cdceedc6744cd9af2859a84a741dea8528023af708
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34