Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc56be91028d7c9…

MALICIOUS

PDF

70.9 KB Created: 2021-05-15 07:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e5df041143071ab5ad73de3a38aa3f5 SHA-1: de325fb30dfc2c6c6fbd6179d7b23cee64d4145a SHA-256: 2bc56be91028d7c9f7c2da1eb65ad750690d901678eb94c4b2489d30eb62d244
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a spam or phishing campaign. The embedded content, though heavily obfuscated, appears to be part of a lure to direct users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=acordes+de+teclado+tus+cuerdas+de+amor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602eec871c44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fdbc281d3b8e.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/20217563872.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/sefamixaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_60656eb30cef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_6054692643f57.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/66619383147.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/boogie_woogie_piano_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_606c0ca724bbb.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/trolls_dance_song_cant_stop_the_feeling.pdfIn PDF document text
    • http://bakavorun.getenjoyment.net/accounting_class_11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5ff7933528957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_6030143523be5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_6002ffa415b2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fdc9aa0e26b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6024321e3ae6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_60426fe612171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_1e5e49a3ee94434c8541caab1e7f94c5.pdf?index=trueIn PDF document text
    • http://newemepakirid.myartsonline.com/rameba.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/materi_barisan_dan_deret_kelas_9.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_7c12c93458514c87b53c9eba2d619332.pdf?index=trueIn 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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 5072 bytes
SHA-256: c7ac84a1c164682f8dcc8904d98d1f7770d2837ed9151620e41ffb1ce93c8973
font_01_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 12032 bytes
SHA-256: 79202ea7f366b03babc59a2ae248394747a1ec8a77f9acf6f4aa762f68635a4f

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