Malicious PDF — malware analysis report

Static analysis result for SHA-256 e755c3d935ef76c8…

MALICIOUS

PDF

71.9 KB Created: 2021-02-19 02:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa3838b4c2d333fdc335edad4938a001 SHA-1: 90bce5579a53f22212ca8ed5a14eee09b79b3c5c SHA-256: e755c3d935ef76c8f98c8f821534a5d40300db14eec051c40c24eecb33457de4
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://crophysi.ru/aws?utm_term=what+size+file+for+poulan+18+chainsaw'. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host malicious links or exploit vulnerabilities. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=what+size+file+for+poulan+18+chainsaw In PDF document text
    • http://bettermoneytips.com/mifipipusawunxhhd.pdfIn PDF document text
    • http://topcabinets.xyz/62126331020j4jj4.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/hcMcgik/duck_hunt_gun_for_sale.pdfIn PDF document text
    • http://foyou.store/64203010817euafb.pdfIn PDF document text
    • http://com-signto6.xyz/the_fall_of_the_house_of_usher_theme_prezi3r04g.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/kZOlhaL/86630631777.pdfIn PDF document text
    • http://dazuxej.22web.org/descargar_biblia_textual_4ta_edicin.pdfIn PDF document text
    • http://arevakar-travel.com/fairly_odd_parents_camp_sherwoodadlvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rafobubavotiba.epizy.com/video_er_online_4k.pdfIn PDF document text
    • http://gejuzimeru.rf.gd/android_google_docs_dark_mode.pdfIn PDF document text
    • http://bewebumaxof.epizy.com/48628535567.pdfIn PDF document text
    • http://vurisadazuxe.epizy.com/isilon_nl400_spec_sheet.pdfIn PDF document text
    • http://leragirifodoz.rf.gd/5106757966.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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 5504 bytes
SHA-256: e7aa9deae7af502b72c3342cd3258fc07f860b931bc6907137e867ada677fd69
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10372 bytes
SHA-256: 5216310bdfb798415a425ea972e011d1db6290ab472563705103648106070e8a

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