Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d939779efb093b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 19:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffca6e401dba383a0b1237d48483dfdb SHA-1: 3d3d5637f43bf9adb2341c487eec57e660074230 SHA-256: 91d939779efb093b6abd88570194ae921ee12865bde67d8146193d7a937c1f93
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9961

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/award?keyword=ardex+cd+fine+pdf PDF link annotation
    • https://fosogizubosa.weebly.com/uploads/1/3/1/6/131637108/180311.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/77593c3c0.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/datefesagufeso_petutu.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/order_of_adjectives_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • https://morimisinasezub.weebly.com/uploads/1/3/1/8/131856414/mijanox_gijazefi_figekirubum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367941/normal_5fddbe9bbb970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5fddb215a07d5.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/xemebuxa.pdfIn PDF document text
    • https://dusukipujadun.weebly.com/uploads/1/3/1/4/131437174/xubon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_600dc71a7a5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fd1731bdac09.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/6330dbe8-a832-428a-93b0-a9f5e540f7f3/99965707266.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/canon_vixia_hf_g30_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ce76a0-92a3-4c43-a5eb-4f9bf309c1b3/62031280729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e9c1b4-f7dc-405e-a83e-247139efc22e/64299428773.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/attractive_man_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/bde_full_form_and_meaning.pdfIn PDF document text
    • http://vomewudige.atwebpages.com/pediatric_ccrn_review.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/31462865996.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/brandon_grotesque_medium_font.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/duxizerikuk.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/facebook_app_dark_mode_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/ccd_vs_cmos_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/maksud_agama_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de76b630-dcae-40dc-8fd4-4cf644c980e1/how_to_operate_cctv_control_room.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/30172234412.pdfIn PDF document text
    • http://mepitar.atwebpages.com/math_about_me_template.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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 4788 bytes
SHA-256: a937a9da1c9f2b7a249da040fdc44e7480a9e186709d46dd20fe69004b82cbac
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 10844 bytes
SHA-256: 4d4109ca86061eadcf97153c38900d731eda188003193c03c59cec21d1dec189