Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd918d6e27b98b3…

MALICIOUS

PDF

98.3 KB Created: 2021-04-09 17:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64718d092a010fca88f2f06b20d6f623 SHA-1: 5d46261f8c874e8c569221032edfb19f8f08e9e9 SHA-256: 4cd918d6e27b98b37d926030a0398c0e9bcf9eb05f7fccd1c7c4849f6166ad43
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, with a primary external URI pointing to 'https://midufefew.ru/strik?utm_term=aashto+roadside+design+guide+pdf+download', suggesting a phishing or malware distribution attempt disguised as a design guide download. The PDF's structure and the presence of disposable hosting links further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://midufefew.ru/strik?utm_term=aashto+roadside+design+guide+pdf+download PDF link annotation
    • http://art-practice.org/30528553606uvjsp.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/haejhgc/idle_roll_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/jcghXji/24855966580.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/ibzgejj/piano_keyboard_black_friday_2019.pdfIn PDF document text
    • http://vaxetopurorebi.iblogger.org/abyat_e_bahoo.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/alfabeto_aeronautico_en_espaolxp76f.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
    • http://xusasun.rf.gd/81198533252.pdfIn PDF document text
    • http://vagaloxesawazo.rf.gd/80543934980.pdfIn PDF document text
    • http://gabozimipuz.epizy.com/bivotenibobodenosenuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd38be5a-3f56-4d3f-8134-ee0f748e7558/85472094470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e2ac60-f3e2-4ee3-a381-c2b71d8cfa54/87563103127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ced8693-dcf1-4021-8f76-9c6fe3670a78/67925061527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3cb5c3-2e29-464a-83e7-625dd4c308c0/rhino_fm60_finish_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e11279-77db-4795-b6ab-b7996dd35e8b/4276604285.pdfIn PDF document text
    • http://pupokimixuveted.epizy.com/97168027155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50b3fed-c7e3-441f-a0ff-b57354638891/24066173372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb25a735-d93c-44b1-85fd-3f7349d60ffc/android_programming_for_beginners_-_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1d0bbc-f1ad-4247-9a05-8abfaafb10bc/23649185653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2995e5bc-c083-420a-a1e9-bc8834b1ab9f/70990255700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8322511-b39d-4f15-8992-586ee56ac8bd/maze_runner_film_age_rating_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6456dbe3-c98d-4a85-932b-a76e410c34c6/notekexotazite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d424de5-cda7-48a9-8b33-038522cbd768/11617708372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d2d1f6-86a1-46a5-ae3e-2230af49f8a7/78467229897.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.

FilenameKindSourceSize
font_00_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 5264 bytes
SHA-256: 21d7f9b16130615624c3b9973aef95b8cabce9ff134454c914e7b7e652f2df4b
font_01_sfnt_off00014602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14602 11784 bytes
SHA-256: 74181102c92a67a527db7e4239f32a4382288b5439e23a732f06aab9ad75c47c
font_02_sfnt_off00016dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3