Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cadd3bf21ddbc7f…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 09:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8831adf664f09a93f232c07413c9810c SHA-1: 99113bf5291f632e2a6815fbb7803394907bd151 SHA-256: 8cadd3bf21ddbc7f2b686236a00e08646641d6b5a7338f1a900672fffc5b49a9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to disposable domains or potentially malicious hosts, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm heuristic further supports this attack pattern.

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://jacksth.ru/strik?utm_term=how+do+you+charge+a+stanley+jumpit
    • http://hardcreditcheck.info/896687081411w5c3.pdf
    • http://tekdouche.xyz/metebotamomakemus1lox6.pdf
    • http://about-central.com/56122336605xphdp.pdf
    • http://mesugowogidevik.iblogger.org/face_shape_guide_for_hairstyles.pdf
    • https://static.s123-cdn-static.com/uploads/4405197/normal_5ff9f31d3ed37.pdf
    • http://dk-inc.xyz/arduino_ide_windows_10_installersj2h5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tosasip.epizy.com/20641821251.pdf
    • http://bexatati.epizy.com/nimabuzepazejezaf.pdf
    • http://zezilometup.epizy.com/tuxiroxugefetufeveduno.pdf
    • http://donidojirujogid.epizy.com/21680338777.pdf
    • http://kawurox.epizy.com/vitamin_a_deficiency_treatment.pdf
    • http://femubavavozemag.epizy.com/stand_by_me_full_movie_online_putlockers.pdf
    • http://pifutujotot.epizy.com/improving_self_esteem_and_confidence.pdf
    • http://jokizexolej.epizy.com/tigunekalebu.pdf
    • http://nakunefizuvodu.epizy.com/google_chrome_for_android_4.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_off0000e247.bin
e8ffee0028f13727064b75de19721d64409a4b13a6708336b2fb897a1d5c89ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 5716 bytes
font_01_sfnt_off0000f5a6.bin
190ddfe9af8365b5e7fbc52f5fe561f53ff669164bb6b88f6fadf27e9b837a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10724 bytes

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