Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cdd3ff8e225653…

MALICIOUS

PDF

73.1 KB Created: 2021-02-27 22:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53b36886e3f681388ff9611fc093564c SHA-1: 18c02bccfcc764d448094cbfed39be7a884e4fcb SHA-256: 95cdd3ff8e225653f9e9d0eda1cd05899f4251393df13be808375795aeeb6e09
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDFs, indicating a link farm designed to host malicious content. The primary URL, 'https://midufefew.ru/wix?keyword=dirt+bike+information+for+beginners', is presented as a lure for dirt bike information but redirects to this network of malicious sites. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely serving as a phishing or malware distribution vector.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=dirt+bike+information+for+beginners
    • http://detonic-italia.website/high_art_vs_low_art9gg21.pdf
    • http://heartcenteredequestrian.com/sumalaxozalakowozepun97yf.pdf
    • http://moxegelubopidi.sportsontheweb.net/10226505926.pdf
    • https://sufogewanogona.weebly.com/uploads/1/3/1/0/131070160/gogala-volewokobulel.pdf
    • http://pek-24.cc/cronologia_historia_do_brasilmjviz.pdf
    • http://chelamela.org/la_mscara_de_la_muerte_roja_pelcula_onlineg3mhq.pdf
    • http://selozufuwadapuw.66ghz.com/90171185955.pdf
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/gigubiwugavonapar.pdf
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/7007566.pdf
    • http://arevakar-travel.com/10816803073tl4zk.pdf
    • http://my-favshoph.online/mary_did_you_know_sheet_music_with_chords38er7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tipesirufig.epizy.com/ligiwenulanukevazumosuba.pdf
    • https://s3.amazonaws.com/xovajukoxin/fovakusamanipadavala.pdf
    • https://s3.amazonaws.com/sajatesawodiji/71959224762.pdf
    • https://s3.amazonaws.com/wifukedot/ikea_malm_bed_frame_second_hand.pdf
    • https://s3.amazonaws.com/xeruxaxer/21219289993.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_off0000e076.bin
255ebd7603e8737ccd3a703c4b6538f59c81e878b56daa084e3fae8fa5758662
pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 5260 bytes
font_01_sfnt_off0000f24b.bin
3ef2001619ffcd9f43de54361126dd3b34447e16de853cbe5ce6a78ad746c8b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10736 bytes