Malicious PDF — malware analysis report

Static analysis result for SHA-256 433859d22b4d2075…

MALICIOUS

PDF

72.1 KB Created: 2021-03-26 06:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fcbb1400e5fe59c2672418befdb60f7 SHA-1: 1f94b657ae46733d4225800e4d258e7e993fe325 SHA-256: 433859d22b4d207545183afa195cafbc713c19bcd6bea1415c44a204d5039966
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or spam distribution tool. The document contains a large number of external links, many pointing to PDF files hosted on services like Weebly, suggesting a link farm or SEO spam operation. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it is designed to redirect users to malicious or unwanted content, potentially for 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=richard+winn+academy+tuition
    • https://fefaterivigem.weebly.com/uploads/1/3/4/3/134375274/datubevegenuxa-tojagenozef-tumalajutaju-xegibejeg.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/mukapelaramani.pdf
    • https://lazarapo.weebly.com/uploads/1/3/4/5/134528324/desudogi_vigafewewiwalu.pdf
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/753c0019.pdf
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/repinukabokufelaro.pdf
    • https://cdn.sqhk.co/sizozizaj/HibYgbT/bike_simulator_3d_supermoto_ii.pdf
    • http://padakogako.iblogger.org/how_many_game_of_thrones_books_are_there_2019.pdf
    • http://buvavarosavadar.iblogger.org/66904257064.pdf
    • http://istlan.space/gagavomonatifajajumurovepsegyi.pdf
    • http://twirlini.com/how_do_i_add_photos_to_my_echo_show_8c7w42.pdf
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/3256debf.pdf
    • http://getyourscore.info/annabelle_doll_photo20co1.pdf
    • https://cdn.sqhk.co/furafurume/ihhfibH/26518861994.pdf
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/8face5cb0a19097.pdf
    • http://banquepopulaire-fr.org/piruzoxosebumudugakexan7dtqd.pdf
    • https://cdn.sqhk.co/defisepeniba/eichhoY/jokopovofut.pdf
    • http://fujubipe.22web.org/farovosadov.pdf
    • https://gobufitiribe.weebly.com/uploads/1/3/5/3/135321776/e20fed59109.pdf
    • https://rejafolurolege.weebly.com/uploads/1/3/0/7/130740622/8290223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dujazenemelix.epizy.com/appointment_letter_format_for_design_engineer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin
dc48022ad861e8d64b51be5e4b43de9ad2ff345416fa876738f0a58a4ba12177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 5172 bytes
font_01_sfnt_off0000ec4a.bin
ccd516b2c03971e6302cfa7ba72f39accc798ed6b61c476d762578e097267cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 11044 bytes

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