Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cbafed54a8be54…

MALICIOUS

PDF

110.8 KB Created: 2021-03-29 01:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ab02687883e40280b4e14e497e6b68 SHA-1: 2cc8fc4760c07a3718500c925430e668cff64ddd SHA-256: 24cbafed54a8be54927042e75c267c6eb419836a650ff07955adb10d3668977c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The embedded URLs, such as 'https://xezojetit.ru/wix?keyword=2020+united+states+presidential+election+in+new+hampshire', suggest a lure related to election keywords to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/wix?keyword=2020+united+states+presidential+election+in+new+hampshire
    • https://cdn.sqhk.co/musutalivun/iEjaiuD/96358447549.pdf
    • http://fredo.run/assetto_corsa_race_essentialsh9rn5.pdf
    • http://pumba.fun/76654566138gm3ur.pdf
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/sexofatofage.pdf
    • http://onlinekartiadesi.com/78752893866cuhc5.pdf
    • http://gratoraama.website/mapa_provincial_de_huallaga_tanager15qzl.pdf
    • http://pet-guru.shop/bejolifabadebewesidaxatow9d89r.pdf
    • http://hermidkovo.info/zobamujemibqc496.pdf
    • https://noginoludaven.weebly.com/uploads/1/3/4/3/134374582/16fe50.pdf
    • http://pixxel.life/what_is_a_6_qt_slow_cookerx4bl7.pdf
    • http://reassurez-moi-fr.info/bupuwafikumumawu420j6.pdf
    • http://onlineeshop24.xyz/english_grammar_notes_free_download6nihq.pdf
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/naveziminujomaj.pdf
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/fbe791118291f.pdf
    • https://cdn.sqhk.co/kubemuzu/XAjdhpg/another_day_in_paradise_instrumental.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_44fd876530e146a09bdab62e87a645a7.pdf?index=true
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_367e85dda6bc4e6a8a8d388b8f20d806.pdf?index=true
    • http://mewarur.rf.gd/8102753746.pdf
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_9237226d290f489c8cded7533cb10ea1.pdf?index=true
    • http://molumazorok.rf.gd/rufavetibajudigisunuba.pdf
    • http://rawijubewivakom.rf.gd/abnormal_uterine_bleeding.pdf
    • http://dijilupejiba.rf.gd/rekuderote.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_off0001706c.bin
94504de12b9f1a2e024cf9a5863d78ab7f9c53301797c625425e7d65fea80cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1706C 5584 bytes
font_01_sfnt_off00018350.bin
f66047c816524833e286aa3935988b1264e92e362fbef1053500cc339fe3e85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18350 11608 bytes

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