Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd539c9ea0fca91…

MALICIOUS

PDF

78.7 KB Created: 2021-02-28 12:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0cacf762704a6b7cc7191ef271d3cc3 SHA-1: 77e41f6d15655e5e86959754609503c960fef573 SHA-256: dfd539c9ea0fca91477b5408a6b520f8db6becf59b6596d0c8a71ee726154750
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, including a link farm heuristic firing, suggesting it's designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains text related to 'economics second edition answers', indicating a lure to attract clicks on the embedded URLs.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=economics+second+edition+answers
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/fa7301.pdf
    • https://cdn.sqhk.co/kuniremolu/ihhaJl5/3076682725.pdf
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/b370f.pdf
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/130a1416ae7cf2.pdf
    • https://cdn.sqhk.co/rizijuwet/jghfcjf/97357497386.pdf
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/755755.pdf
    • http://rejemezurufoveg.mywebcommunity.org/the_unbearable_lightness_of_being_subtitulos_espaol.pdf
    • http://powerpoint4you.ru/street_fighter_5_apk_mob._org0c3bh.pdf
    • https://cdn.sqhk.co/lajoroteb/CuZ7gjm/spongebob_sponge_on_the_run_full_movie_dailymotion.pdf
    • https://cdn.sqhk.co/libavesonon/sidFje0/bunopigifizurufowo.pdf
    • https://cdn.sqhk.co/vanewano/5Pchagt/freestyle_xtreme_voucher_code.pdf
    • https://cdn.sqhk.co/jarogofef/8Hjbihi/tic_tac_toe_neon_glow_uptodown.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/puduvamoji-sovanusasizofeb-dalomawi-madifexuw.pdf
    • https://cdn.sqhk.co/loxepafigav/KieonGP/black_friday_hp_laptop_deals_uk.pdf
    • https://cdn.sqhk.co/janawezexoj/dgdicie/homescapes_coin_hack_2020.pdf
    • http://fisareboveda.getenjoyment.net/99017937370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/savifin/nationwide_pet_claim_form_printable.pdf
    • https://s3.amazonaws.com/likerajatob/mepibatorozux.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/63503075883.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c9.bin
d4cabc8f5ef4620f0e3f39c164b54baa829e30bb84253ceba9cb91037f0fd438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 5100 bytes
font_01_sfnt_off0001091f.bin
064e5722612d04e4cb0064e612af5dbf6d7c40ac69d5eac173ad1216647edee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 10656 bytes

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