Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8fbaf3180a6d69…

MALICIOUS

PDF

74.6 KB Created: 2021-02-26 12:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7335409d30ff410f6f7231909560931e SHA-1: 459990da988782553841cebbe003b7d411aca985 SHA-256: cd8fbaf3180a6d698a2d21c7a54bf5f02b0a5c8ef2c386e485031e0aed684ce7
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Dante's inferno 2007 dvd' and 'wkhtmltopdf', suggesting a lure or a method of obfuscation for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mezovuduw.ru/aws?utm_term=dante%2527s+inferno+2007+dvd PDF link annotation
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/256432daa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368474/normal_60004488a8e95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_6004a0c2cb447.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/D2jd7ji/murder_mystery_game_fortnite.pdfIn PDF document text
    • https://wipikiriku.weebly.com/uploads/1/3/4/6/134696444/cd940f9bfa.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/kudegesotisikirorixezepen.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/zimubud.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/how_to_use_remote_control_for_spectrum.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/wufine-gubujikelot-sakuzukokuduli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_602ee41ae12ec.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/EhcDhi6/virtual_drum_set_online_play.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/the_game_awards_voting_results.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sexuduwivaz.rf.gd/fuxisi.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/ruud_silhouette_ii_gas_furnace_reset_button.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/18153675380.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/lsa_international_internships.pdfIn PDF document text
    • http://xabimeweveme.epizy.com/zonewexugilanuruf.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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 5316 bytes
SHA-256: 9a303b228b5e7d15b365095fea942e0e1555fbed85a552203a8de2c7a1d85eb6
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 12144 bytes
SHA-256: e000d2ae659f58e98bdc44fbd03b2b45940b3f5f306d84b5377404acddc554e1

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