Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc14d0811652754…

MALICIOUS

PDF

74.9 KB Created: 2021-03-14 03:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a51cb4fd6d44b8dfc9c4820c825718 SHA-1: 76e51ee66273b999cb2c809db3340b7933ebeb9d SHA-256: cbc14d08116527541cfd08b545b09ad8b8064660a1d5758a5eceb04b219448fe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords like 'Advantages of communism pdf' and mentions 'wkhtmltopdf', indicating it's likely a lure. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings confirm malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=advantages+of+communism+pdf
    • http://nupesupo.mypressonline.com/identify_the_principles_and_elements_of_art_found_in_sculpture.pdf
    • http://umdtheatre.ru/blockchain_and_cryptocurrency_full_coursesezqxw.pdf
    • http://setokanekema.mygamesonline.org/41853244978.pdf
    • https://benedelewerovil.weebly.com/uploads/1/3/1/3/131384674/bepob-gulapu-dewojupozusa-nigixetanima.pdf
    • http://pushbiz.fun/george_foreman_grill_instructions_burgersbiw5s.pdf
    • http://parkingtest.xyz/83663429606dutew.pdf
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/003c1d.pdf
    • https://pebizenif.weebly.com/uploads/1/3/0/8/130874023/0c0b1593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_7653678ab17c460eb4e533944a5ada6b.pdf?index=true
    • http://kepewitibafef.myartsonline.com/rutina_de_ejercicios_para_aumentar_masa_muscular_en_casa.pdf
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_1f4f4ae1c2e540b6953782b732b2c656.pdf?index=true
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_9cb31db8a37447ab9f7fd3a4ae4b9a14.pdf?index=true
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_5e04d87fb3b942978427fac87ee34a43.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_6dac6a81b0d746c18338b8076d4c958b.pdf?index=true
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_c6880e800c694a00aff33d50e504e78c.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_e2f54d6fd796451097eed11a7e09923a.pdf?index=true
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_f7a11a4e9899403baad9b82276468a28.pdf?index=true
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_449f6dd245244a349e9a9a1848398a9a.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97b.bin
54060569dcdd55f53f1da3397a1f8abf15e36dd684920b9a4c10b9bb6b5ab5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5396 bytes
font_01_sfnt_off0000fbd9.bin
3b1523dcde4acfa568110f551084707d51cd9254e28d7a9204b4a3032a101381		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10180 bytes

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