Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4f6fadba6cea7c…

MALICIOUS

PDF

172.5 KB Created: 2021-04-13 17:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1af9223ad879f3a26ec2e3c94a2419da SHA-1: 1afd0da5a728fbc6947b5461f15387e27e7fbe3f SHA-256: de4f6fadba6cea7ce02638786672bca24f1b17afb758b8064abc2f921ec88c8f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of 'utm_term' in one URL further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://baarspo.ru/strik?utm_term=is+skim+milk+21+day+fix+approved PDF link annotation
    • http://xafesuvorolivig.scienceontheweb.net/jepifa.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/post_analytic_philosophy.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/igSjdhg/zusasogar.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/basanta_bilap_download.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/34904439014.pdfIn PDF document text
    • http://koreanluxe.com/98774686827o0ean.pdfIn PDF document text
    • http://amorexpo.com/trigonometric_identities_definition_and_examples4lbza.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/iVjigdt/lee_brice_songs_written.pdfIn PDF document text
    • http://kvyovk.xyz/3rd_grade_phonics_workbookv21ki.pdfIn PDF document text
    • http://sks-expertiza.ru/99865238385gowsy.pdfIn PDF document text
    • http://dikebar.22web.org/sonap.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/lizitiropamakate.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/bilomuzo.pdfIn PDF document text
    • http://reetodo.online/415150407966gixn.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/fgfjigi/best_free_streaming_app_for_android_tablet.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/biwosilifeweponubezelu.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabumumiw/hacGhf8/warufurejeporevoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelubameta.epizy.com/lotetegagizipamebawi.pdfIn PDF document text
    • http://nanomunem.epizy.com/94160022151.pdfIn PDF document text
    • http://sivutesafukim.rf.gd/bejovepur.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/gemoxovavaximomupepiz.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/vakupape.pdfIn PDF document text
    • http://wijotifiku.rf.gd/lenasipale.pdfIn PDF document text
    • http://nokolul.epizy.com/menogowigaleguwixutizuxe.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/alejandro_jodorowsky_libros_gratis.pdfIn PDF document text
    • http://lilorubetu.epizy.com/16238579082.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_off000268a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268A5 5604 bytes
SHA-256: be814b9265b95f2f6a4694d15f7f2b0c6942482f9573728a23b082657cc6a545
font_01_sfnt_off00027bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BB7 12040 bytes
SHA-256: 17555a778d2c092f000a2a1cc12d1b918cb56e88698ef4f1719f761c1b67fb0d

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