Malicious PDF — malware analysis report

Static analysis result for SHA-256 df16ad33a4a5bacf…

MALICIOUS

PDF

83.2 KB Created: 2021-02-27 10:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f69e146db2434e8eaa47dd0568a3a4c SHA-1: 9f845113b03b64e8a552a32206eb8a1db39fc0ec SHA-256: df16ad33a4a5bacf689b4c8faa8b2e42832d4d1874258068ebb6aa202462d266
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment.

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://seumenha.ru/strik?utm_term=que+es+la+recurrencia+semantica+ejemplos PDF link annotation
    • https://pokukumujipuk.weebly.com/uploads/1/3/1/8/131856200/gixij_xagavofaxovogej_rupalaneg_dofetukinafa.pdfIn PDF document text
    • http://suvigulujuve.22web.org/77760505003.pdfIn PDF document text
    • http://nezikitif.iblogger.org/bitlife_android_vs_iphone.pdfIn PDF document text
    • http://expressvpn.store/825049822593ajkv.pdfIn PDF document text
    • http://kyhni.site/where_do_you_get_bubble_tea_near_medvic4.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/soxirobip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_6006a97e6b7af.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/what_is_pilot_arc_on_a_plasma_cutter.pdfIn PDF document text
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/3214446.pdfIn PDF document text
    • http://kekebum.22web.org/ravij.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/how_does_cinder_end.pdfIn PDF document text
    • http://want-seo.ru/battle_trip_15123ysu.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/vibewejixire.pdfIn PDF document text
    • http://qqkaxes.xyz/cribriform_plate_of_ethmoid_bonepesww.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://dikawixum.epizy.com/wadaranotujunememo.pdfIn PDF document text
    • http://sazurukoxoje.rf.gd/zaviroraxo.pdfIn PDF document text
    • http://zuvemodu.rf.gd/dua_hizbul_bahr_download.pdfIn PDF document text
    • http://sewogixura.rf.gd/27331219381.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 5216 bytes
SHA-256: e1c077afc21e5857f807ebd96d12cf0aa53fe2ef2a921c557692551a6c1dbdcd
font_01_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 6068 bytes
SHA-256: 58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717
font_02_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 11636 bytes
SHA-256: f263a3500de9d933885d18863303eb34fee7c36aa7790f8b67710bac62849e51

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