Malicious PDF — malware analysis report

Static analysis result for SHA-256 113ff38f4d8f80b5…

MALICIOUS

PDF

78.3 KB Created: 2021-04-07 21:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a7f98cf37ed57c97ebd48695a2c11a2 SHA-1: c7328f2ba9ca09071ea3f2aebbcd4e5716f0958b SHA-256: 113ff38f4d8f80b5ec47a7d693b7eff93745c59e0721af54b9cb0618a8228614
186 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 0.9997

Heuristics 6

  • 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.
  • 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://xajibur.ru/aws?utm_term=the+man+in+the+high+castle+cast+season+3+episode+1 PDF link annotation
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/8415775.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/23eea6e932fead.pdfIn PDF document text
    • http://unosital.space/biriyani_hd_video_songqdvyo.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/ahhhety/cinema_city_warszawa_galeria_mokotow.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/zugatabadokup.pdfIn PDF document text
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/buroxo.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/iRDXjg1/28721181552.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/lieGahj/xixopekola.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/6282551.pdfIn PDF document text
    • http://raisinshq.club/lujixetikiwulorekusiczkhl.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/f80e1782-cd86-4ebe-a947-c94efcf9ce16/printable_caps_for_sale_coloring_pages.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_10713f98a21d4f028a533e8b22321ec8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f390d9-b275-49c9-8aa2-72c820d290b8/o_que_eu_posso_fazer_para_engravidar_mais_rapido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89749fd-ed50-4f80-a89c-d891bdd12090/what_is_a_geometric_formula_in_chemistry.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_e55cafd1d362403fbfa0521434cb5c01.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_75064099075b49cda35636cc4f0e74d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0e6c48-8721-4e4d-8cf8-f0e3dc62fca9/bissell_cleanview_helix_filters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f425f535-ec15-4525-bebd-fc2c436e53c0/what_software_can_i_use_with_my_cricut_expression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cece42-735f-4a54-aa9d-8aa330967490/bilifisalosituwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a07739-5320-400b-8ce0-0b3ccd8713fd/6989916646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962c3e34-8410-41da-9c8e-555425d278a9/dumanaloken.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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 5556 bytes
SHA-256: 1686561e9e11b2eb9f642cbbf8e77308f6058aeb7530064dc40cbbd292b44758
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10876 bytes
SHA-256: c3cb4b80620df0a56f92ce43f1225a9ad27ac1c17beeb93d47caf5d1365c576a