Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4476ef3e555e287…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 05:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac5c1de58eac6a48a5411f44e27a8466 SHA-1: 2b3eb1240951afc65a51bf69855fbbe81738154b SHA-256: b4476ef3e555e287bf33014f04ae544195a9bca7b281d00027a7e71241f56055
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=relative+pronouns+exercises+for+esl+students
    • https://cdn.sqhk.co/wisivelu/rx8gefd/gezotilodoromutegezabew.pdf
    • http://warokibujiz.getenjoyment.net/5727828253.pdf
    • http://julaximufe.66ghz.com/67190262878.pdf
    • https://cdn.sqhk.co/wunokebewoz/CSthfOE/kamomimo.pdf
    • http://repuvotase.iblogger.org/2007_jeep_grand_cherokee_crd_specs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a0ca75d6-82b9-41ca-9d1f-125bce323b62/cards_against_humanity_online_app_with_friends.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/wd_tv_live_media_player_specs.pdf
    • http://nowaginog.epizy.com/57732751029.pdf
    • https://uploads.strikinglycdn.com/files/8682bf95-c5f3-42e5-b0bd-25cb706803e5/bozofuwipuzovixumoxebeza.pdf
    • https://uploads.strikinglycdn.com/files/f909c7cc-3732-4b70-b091-071afa058301/ge_33709_4-device_universal_remote_manual.pdf
    • http://bumurulepowele.myartsonline.com/require_once._vendor_dompdf_dompdf_autoload._inc._php_failed_to_open_stream.pdf
    • https://s3.amazonaws.com/zerepuzuze/tuxedenu.pdf
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_d78beddb1f4845bcaadf00f5b03f895b.pdf?index=true
    • http://sonisan.epizy.com/kasopuvadosimaj.pdf
    • https://uploads.strikinglycdn.com/files/393a35b4-8cfe-4c64-ae43-1067f27051ea/84927514283.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_7633c171bbf14a9399c43d8fda289e22.pdf?index=true
    • http://bolirazebaf.myartsonline.com/adobe_premiere_elements_11_freeze_frame.pdf
    • https://uploads.strikinglycdn.com/files/d04071b3-f736-4981-ada7-4d39949880ca/how_do_lions_protect_themselves_from_predators.pdf
    • http://vusedew.myartsonline.com/fundamentals_of_agricultural_economics.pdf
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_afcbe92fad9d431d9e2743688979accb.pdf?index=true
    • https://s3.amazonaws.com/gofilafixu/the_art_of_problem_solving_vol._1_the_basics_download.pdf
    • https://s3.amazonaws.com/tanapilamaxi/lodojiwoligigejema.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbc.bin
0b6fa78f9bc0a9e428d5bd24d8cb6da498de8aa539191b92f162040f26c55068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 5164 bytes
font_01_sfnt_off00010163.bin
e02b77a0d79f403a671b651fd30c36e8adf691bf23a7167e08d26155ab6ca74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 10532 bytes
font_02_sfnt_off0001257e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 4324 bytes

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