Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31dadd38d005997…

MALICIOUS

PDF

79.1 KB Created: 2021-04-23 08:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7372c7d153be692fd2b72de11a59310a SHA-1: 5179bc03eeac24b176039ec542d0f5d651f55f04 SHA-256: f31dadd38d005997bcada13a1713ffd132b8a392070650378f3e51c68e3a0a73
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, many of which point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect the user to attacker-controlled infrastructure.

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 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.
  • 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=what+the+bible+says+about+divorce+and+marriage PDF link annotation
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/memel.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/vubawedupidafovujakulaku.pdfIn PDF document text
    • https://tujalulu.weebly.com/uploads/1/3/4/3/134382228/xibiribekef_vagalokavira_pajobag_ritanu.pdfIn PDF document text
    • https://tidukunetubuf.weebly.com/uploads/1/3/2/7/132710673/vunupaguzida-wigorikaje-tulet-zakawunor.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/96753555851.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/iggTdeS/86275077910.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/9OrqgeG/metal_slug_3_apk_softonic.pdfIn PDF document text
    • https://woxejisuwu.weebly.com/uploads/1/3/4/3/134322210/nuvozub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifazofikumufe.epizy.com/96290925861.pdfIn PDF document text
    • http://mukexojot.rf.gd/guided_elk_hunts_in_eastern_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/lg_lfx28968st_air_filter_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/76615327610.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/mechanics_of_materials_8th_edition_gere_goodno.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/30075637856.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/is_shadow_and_bone_a_romance.pdfIn PDF document text
    • http://gizugutopaf.epizy.com/the_golden_tower_magisterium_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/62385451947.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/parabola_equation_forms.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_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 5668 bytes
SHA-256: cca3319e12e5c2597a1c4525341eeaa7d92b7af1ee806bbaebe73da2e6a6225b
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11868 bytes
SHA-256: ecc1d038ad2b924a8f109286a2773e964706045489f68a5f9cd26fd0ddf73891

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