PDF malware analysis — malicious · cf9f1ce70985c0f4

MALICIOUS

PDF

85.6 KB Created: 2021-05-26 19:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: bf028d4d2d89f33e3bcd05c2db0c16c7 SHA-1: cbda53829a5279a1d4194461c6e4f72d2b9ebd51 SHA-256: cf9f1ce70985c0f4cd8e0969fd1fe37740723583cd00d96de3863f3b90c48ba5

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or malicious link farm, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. It contains numerous embedded URLs, with a primary suspicious URL being https://xajibur.ru/strik?utm_term=cement+plant+maintenance+pdf. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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/strik?utm_term=cement+plant+maintenance+pdf PDF link annotation
- https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/xupidogafe-vutax.pdfIn PDF document text
- https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/wiledanifafis.pdfIn PDF document text
- https://vifusixediw.weebly.com/uploads/1/3/5/3/135312005/roben.pdfIn PDF document text
- https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/4108388.pdfIn PDF document text
- https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/c28d59c6cf22fbb.pdfIn PDF document text
- https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/7ab29ba7bb3392.pdfIn PDF document text
- https://puniduvete.weebly.com/uploads/1/3/4/3/134341297/jegifobemux.pdfIn PDF document text
- https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/8586508.pdfIn PDF document text
- https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/gixikul-zopitikit.pdfIn PDF document text
- https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/kixazujilogu-dajirowixoxa.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://uploads.strikinglycdn.com/files/a306d42a-ecc8-47de-a6eb-9285cfa8076d/how_to_pronounce_piriformis.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e3c7d26f-828e-4e7a-914d-2cd09f5ff880/zukurokefo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0a5abdfb-1f3a-4eda-b48f-ae3af8b4cd1f/8472906116.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ace82482-344c-4d2b-bb23-fa87ed448ace/ms-7778_ver_1.0_motherboard_drivers_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/91c03b08-43ef-4875-b2bf-a97ea8a9b1a3/65225902718.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2760a228-995d-41cb-9713-d023e54ca360/right_triangle_trigonometry_solving_word_problems_worksheet_answer_key.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00010692.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10692	4728 bytes
SHA-256: `11c50be11b13cc4e6a993231fcd5ee9135c0728c3591d8b08eb7c706866b4947`
`font_01_sfnt_off00011689.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11689	10696 bytes
SHA-256: `6651c0c220dfe942177a4a02b8961155e880fbec44ff0681882f2a72c3e13fb7`
`font_02_sfnt_off00013b06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B06	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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