Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7af5acd0051930…

MALICIOUS

PDF

80.0 KB Created: 2021-01-25 01:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fed6f9f2a4109d5ad42f97328a34de45 SHA-1: 8c22819f6dacbf9018b3b6b9ce5bf746e65dd786 SHA-256: bc7af5acd00519308692157c7ece11b6484501c417c3d7be6f08fec659775f1f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs and the heuristic firings point towards a phishing attempt disguised as a file format error, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=android+apk+file+format+not+supported PDF link annotation
    • http://idealica-columbia.site/sportsmax_app_free_download5wc69.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/6a861427a0bd.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/tavizes-sexomuw-dajuzed-moper.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/ee43c7b.pdfIn PDF document text
    • http://busurman.space/jajiritusagedulujinizisjdar.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/50525bd.pdfIn PDF document text
    • http://nasporte1.fun/faction_dictator_2._0_2018_reviewgk1kv.pdfIn PDF document text
    • http://allostar.buzz/3346900289630wxq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekowezitodog.rf.gd/puvutadudojiwerebo.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/wanabufajujudasenugaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/amiibo_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/enterobacterias_em_alimentos.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/39715889249.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/chhello_divas_gujarati_full_movie_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/21634744223.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/astitva_kannada_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/lake_chabot_vallejo_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/47814663433.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_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 5240 bytes
SHA-256: 98c1d1c43aa6c284a43c6ed26f6c568e38f3abea6ebbcd84a99fb2bcebfe2729
font_01_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 10596 bytes
SHA-256: cccb351667b483d16824c9554ffd8ebd45263ecd85344c554363a58f77e5d452

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