Malicious PDF — malware analysis report

Static analysis result for SHA-256 9786bba0348e05ae…

MALICIOUS

PDF

74.8 KB Created: 2021-03-21 06:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4758823b74b8ab6d9463bedb6ba86f43 SHA-1: 9d500ff14b55f6a1f5b350005f87047fff5ceb2c SHA-256: 9786bba0348e05ae67d76c9d81b49ccf58516955af6cab89ea1855f1959104ea
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to drive traffic to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=classes+of+drugs+pharmacology+pdf In PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/kutesupufenu.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/vevupinogulasevonur.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/jeporixekasavoxugise.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/how_to_connect_canon_mg2520_printer_to_computer.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/how_do_i_change_my_centurylink_modem_name_and_password.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fd23009db2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_6007ec6362af2.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/51510dc3-ea93-4ea8-98d7-3ee77d38c756/sundiata_an_epic_of_old_mali_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d830cee-856b-4c7c-ac74-5422cd60c16c/liraniguwuzujulifisejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/xunatumovepotijeger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378b01b7-223f-4720-930f-3be81c99324b/nj_drivers_license_real_id_act.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/odd_thomas_cazador_de_fantasmas_trailer_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/pifeje.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_9c37906486cc4cd78f606b65e4b82e70.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_2ef0335fa15a4e50802d2caedeac92a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e674d64-b488-42fe-ab4e-faef70bea3cc/ketobifozaradonivu.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/canada_provinces_list_short_form.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/fewoxisezivazekaburis.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5576 bytes
SHA-256: 813d504bb9cec31cfc03d70c2125da73aa74abe3ae7f33b2bc184b9af3707303
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10132 bytes
SHA-256: 6838714827af57bae8dd727e7611857a6c1cd6cb18ffa3e074a5844c649c23f2