Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13c15b018b510a8…

MALICIOUS

PDF

88.4 KB Created: 2021-02-17 04:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c818e17094d020220b677417641d02e SHA-1: b1ec78016b4b912d56955b098cc7147c7835009f SHA-256: c13c15b018b510a880305b190177fd39291850c670f0f281d06cb3c8e096ceea
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, suggesting a phishing or redirection scheme. The presence of 'utm_term' in one of the URLs further supports the idea of a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=are+chainsaw+sharpeners+any+good PDF link annotation
    • https://cdn.sqhk.co/supuzeren/dJghojc/choices_stories_you_play_queen_b_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_6016ed5338328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5ff0b2fa1b1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/4jejjKz/67839878314.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/h3hj7id/the_roommate_netflix_trailer.pdfIn PDF document text
    • http://fafazegadaxe.22web.org/follow_me_bbc_learning_english_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/LTjaWBt/money_express_prestamos_bayamon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexatati.epizy.com/nimabuzepazejezaf.pdfIn PDF document text
    • http://widafasamuj.epizy.com/caballo_de_troya_book_in_english.pdfIn PDF document text
    • http://fewajun.epizy.com/videoder_pro_for_android.pdfIn PDF document text
    • http://jilovin.epizy.com/fusovaxu.pdfIn PDF document text
    • http://jefebewo.epizy.com/case_39_2009_full_movie.pdfIn PDF document text
    • http://zasujofimak.epizy.com/black_veil_brides_all_songs.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/52281860743.pdfIn PDF document text
    • http://gurebuvijo.epizy.com/aha_hypertension_medication_guidelines.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 5488 bytes
SHA-256: 858f5ada2ce46564a0c9c2482f7e2d355f11440e050c147e236bd13f0adfdf38
font_01_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 10640 bytes
SHA-256: d7fa6703e75d5e39c8f9bad67db8cfa8a9aa5cb36e5b494fda9736b6192b5e8e

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