Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38c6bfd46a9480d…

MALICIOUS

PDF

80.3 KB Created: 2021-04-29 03:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff8ef8dcace6a14a8b234e535a73dceb SHA-1: 0ead43756b92a7d159eee0ff407c855eea005db6 SHA-256: d38c6bfd46a9480d7a020e699fd12a6ac9c0ddca91ef5052842f19163e866dfc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The embedded URLs likely serve to download further malicious content or redirect users to phishing sites.

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/strik?utm_term=dymo+letratag+label+maker+won%2527t+print
    • http://jizerigozigalav.getenjoyment.net/sataxotoruwiras.pdf
    • https://cdn.sqhk.co/foseziwate/J9nuMgg/fresh_deck_poker_installed.pdf
    • https://cdn.sqhk.co/fopikudapom/LjbOgBF/pumaximajajoka.pdf
    • https://cdn.sqhk.co/padezeda/iajjeck/53443002209.pdf
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/8492294.pdf
    • https://tilifopufobi.weebly.com/uploads/1/3/6/0/136049844/9940ea09f6.pdf
    • https://cdn.sqhk.co/dofexoxev/7I2gUG0/3991768113.pdf
    • https://cdn.sqhk.co/gutifusuf/9jhhahP/86680367891.pdf
    • https://cdn.sqhk.co/dedizozife/Zjg2kYF/zombie_attack_codes_2020_roblox.pdf
    • http://salebox.shop/53180767618d6ctm.pdf
    • http://zajilakofudo.scienceontheweb.net/lipepulominirizujo.pdf
    • http://dosubodanes.mypressonline.com/tesis_energias_renovables.pdf
    • http://talemine.getenjoyment.net/34754600242.pdf
    • http://vodoroding.info/codigo_ascii__en_cqjs3a.pdf
    • https://cdn.sqhk.co/woledibiroju/hdq8ja6/73739547192.pdf
    • http://nesobaka9.xyz/24866586635rrigl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizuluworafid/caller_id_faker_text_android.pdf
    • https://s3.amazonaws.com/fosawef/smiling_small_baby_images_free.pdf
    • http://tirisesu.onlinewebshop.net/kiran_publication_bank_po_reasoning_book.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_off0000fd36.bin
d562d5da62de4a210f82485c75f7032e015d24719a25168e3170f51ff4ce86c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 5392 bytes
font_01_sfnt_off00010f9e.bin
d25a19038acdcb40c0370056e9173a0aad9f32fcab5bc3a1721d3a23b0645ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10716 bytes