Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafc7ef8813e73fe…

MALICIOUS

PDF

72.4 KB Created: 2021-06-05 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 303580d1cd1cdd80c74aebe77b694a7b SHA-1: 23232a20c7472954b33fc3e4e3fe68adaeee490a SHA-256: eafc7ef8813e73fec9a8976430292a91f307665da78074f6c4a993a08dbcb35c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=o+holy+night+piano+sheet+music+chords PDF link annotation
    • https://pitudonela.weebly.com/uploads/1/3/5/3/135323021/4027407.pdfIn PDF document text
    • https://xalidowugeduvek.weebly.com/uploads/1/3/7/5/137514787/kowiwagebeba.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/841746.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/5754235.pdfIn PDF document text
    • https://kabuzelegogem.weebly.com/uploads/1/3/1/4/131453274/panoxozagibisik_pumamulawir.pdfIn PDF document text
    • https://xaxusirawo.weebly.com/uploads/1/3/4/3/134318026/6954129.pdfIn PDF document text
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/4291329.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/9504114.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/4d14ea06-d340-4cd4-9202-4ec21cc14f19/injector_apk_for_laptop_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c3ab78-55f6-4a79-a495-38ec46cdd870/mfj_939_series_automatic_antenna_tuners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b330444e-6554-4d58-adb0-030067b470eb/tifusawurabumebafaxonudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ca5263-ea0c-4274-a584-b9206359ea8e/how_to_write_letter_to_airtel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2868ab98-8722-428b-a4ea-4f7c9e2bda40/singer_solution_to_world_poverty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13dda9e1-939d-4b56-8691-c5cf0336acac/14969546951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544f182c-fd68-4c31-b8f8-efaa790c5941/6193993798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb9d206-295a-442f-a19d-9274bb5bd9ab/general_anatomy_handbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cdf5cd-821d-4556-b688-713516e3e33e/xajexofobasizege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d93a213-39d4-468d-aa33-2b0f66f35e36/wiwowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01bd12a-c3a1-47fe-8632-6f6199f83264/54506351633.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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 5616 bytes
SHA-256: d1798c656e67c406e636f83216d277de6bb8bbe400ced41970901309bb646fab
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10324 bytes
SHA-256: c66de8e55fbe3ac59aba492c9ec46b32e26cead2f476a889d37a77de862244d1