Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c40b03e0123ac33…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 18:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd1200a12bcfb193e31a5b830071e62e SHA-1: 96f27a121b9c84aa6ed50022d80d9ae4c4b2f410 SHA-256: 3c40b03e0123ac334334054c0eab04c99d7ed27f713ed97a1956fc4fa1569026
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a website that appears to be related to search engine optimization. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of numerous links suggests an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=olympus+om-d+e-m5ii+manual
    • https://cdn.sqhk.co/vasinabew/hhXjdhh/free_2nd_grade_first_day_of_school_activities.pdf
    • https://cdn.sqhk.co/kavonalitego/jjOutjh/translate_on_screen_cracked_apk.pdf
    • https://cdn.sqhk.co/febapaji/idhDhfM/jifevetinegiparojefonerar.pdf
    • https://cdn-cms.f-static.net/uploads/4445882/normal_602a2bdd699b9.pdf
    • https://cdn.sqhk.co/vasibejovej/dqNiapY/wozepufeke.pdf
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5ffccea3a55a2.pdf
    • https://cdn.sqhk.co/navimoxa/argdqYD/ping_pong_table_covers_for_sale.pdf
    • https://cdn.sqhk.co/rubupidorinu/gv9Kyif/zagovomewilawe.pdf
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/revasuten.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/delomesine.pdf
    • https://cdn-cms.f-static.net/uploads/4479212/normal_6058ddd04a1da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kulinisokakewi/tetifigetarowitosorajawu.pdf
    • https://s3.amazonaws.com/kulinisokakewi/92264918799.pdf
    • https://s3.amazonaws.com/viboxikuz/mehandi_circus_movie_in_moviesda.pdf
    • https://s3.amazonaws.com/muvazi/balochi_language_learning.pdf
    • https://uploads.strikinglycdn.com/files/449db8ce-85df-4489-b93b-a989b076da07/76970809836.pdf
    • https://uploads.strikinglycdn.com/files/39e7fdc5-491e-46ab-8e34-87705b27bd8a/what_is_the_best_magic_tree_house_book.pdf
    • https://uploads.strikinglycdn.com/files/973bc408-563c-4639-9c93-cc30ad34493b/50312723652.pdf
    • https://s3.amazonaws.com/mufukep/capacitor_220_microfarad_datasheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54b.bin
cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 3312 bytes
font_01_sfnt_off0000f12c.bin
2ee930f5224e3cca5d922a5d00e171469818ff0e6edb5e603b5000d6ab7aab9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5292 bytes
font_02_sfnt_off00010329.bin
a5d990558e745d28b61bdf9480e936fa6c3e6fde153cebf0c281cd8ebc8b1898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 14412 bytes

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