Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5714550138d78be…

MALICIOUS

PDF

75.9 KB Created: 2021-03-15 19:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 57d5d698487ee43caf2989c886f51154 SHA-1: 9e35430554ede098500ce11f7c77457b66384adc SHA-256: e5714550138d78be7350445008988d52bafbc4af505698109b2b7b14ba0a830b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'Head first design patterns' and 'wkhtmltopdf', suggesting a potential lure or a tool used in its generation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=head+first+design+patterns PDF link annotation
    • http://paxosij.mygamesonline.org/how_to_read_financial_statements_for_investing.pdfIn PDF document text
    • http://parkji5x.xyz/powimeribhd28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5fcfa68e386bd.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/iXhe0aL/mubanelesidu.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/LJjgrhf/zulefomukobekugonimozuli.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/fjdgghb/fancy_pants_adventure_world_1_remix_friv.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/mOhedie/biximawa.pdfIn PDF document text
    • http://hellesypakk.online/what_is_the_healthiest_thing_to_eat_at_bojangleslgi1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_600f8eedee178.pdfIn PDF document text
    • http://sparzha.club/esl_free_online_reading_comprehension_exercisesrda9n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_6026a3f850e58.pdfIn PDF document text
    • http://tublitalia.fun/pobugupilozawdndt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_60466f7aab28b.pdfIn PDF document text
    • http://icily.xyz/anchorfree_hotspot_shield_vpn_windows750tu.pdfIn PDF document text
    • http://subuvotugijad.iblogger.org/adobe_acrobat_word_converter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f28223-3a39-4d9c-87d0-815a931b5a20/convotherm_oes_6.10_mini_combination_oven_steamer.pdfIn PDF document text
    • http://tarobajasupimi.epizy.com/tidigevod.pdfIn PDF document text
    • http://womawujun.atwebpages.com/the_cask_of_amontillado_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a80e6e3-8b56-4368-ab4e-90dd907265c1/garmin_nuvi_750_battery_replacement_instructions.pdfIn PDF document text
    • http://samitis.rf.gd/worth_it_fifth_harmony_hd_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf2bb2e-bfad-42c3-89d2-b561bf04d16f/19733658999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6454b2d-b9d0-4c81-9f08-bce1dda4eb80/dupiwaxinolizetunegoxar.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_will_the_stars_look_like_tonight.pdfIn PDF document text
    • http://fanuzisi.epizy.com/ncert_chemistry_text_book_class_11.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5136 bytes
SHA-256: 2bbab1dcf0ad26efd21da91b5beb81e3fb9f1327c870625973f50a7d4c2bed07
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 11864 bytes
SHA-256: d1d34c978f4d1112f1c9baef134bc990dc7dce29d9e93edfedc6d94e6a454ca5

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