Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fd1cb497b1b660…

MALICIOUS

PDF

82.0 KB Created: 2021-04-01 09:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ff5d09821d8c791a1334bb073b56114 SHA-1: 9e034a932735cbd0bfa30964566ba2250b5fb82d SHA-256: a4fd1cb497b1b6607db6efcf0b36d5ba8c7234655628d0777a91dae0b59601c4
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body is heavily obfuscated, but the presence of the external URI and the malware detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://vilenefex.ru/award?keyword=ocean+of+pdf.+blogspot.+com
    • https://cdn.sqhk.co/dufubimaru/uhf1mhc/crossfire_board_game_instructions.pdf
    • http://waferaboteb.mypressonline.com/container_sizes.pdf
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5ff2f5a25f12e.pdf
    • https://cdn.sqhk.co/wirowanorax/hijhlpd/rankle_in_a_sentence.pdf
    • https://static.s123-cdn-static.com/uploads/4387562/normal_5fe371c91f9e0.pdf
    • https://cdn.sqhk.co/fimegasaz/b3idvth/very_loud_apple_ringtone.pdf
    • https://cdn.sqhk.co/riragimi/ijKhjFN/garden_luscious_strawberry_theme_song.pdf
    • https://cdn-cms.f-static.net/uploads/4411511/normal_602a48164ba55.pdf
    • http://xerijegodufiw.mypressonline.com/vending_machine_business_plan.pdf
    • https://cdn-cms.f-static.net/uploads/4450721/normal_603ec52dba0ce.pdf
    • http://rakapugijumub.sportsontheweb.net/86838976545.pdf
    • https://cdn.sqhk.co/sesijisova/duAHoji/blackberry_work_launcher_icon.pdf
    • http://nanamojuvimujo.medianewsonline.com/dujimazinawukugewoxozoge.pdf
    • http://xawamiwupajev.mygamesonline.org/demogo.pdf
    • http://naxiramomamaz.66ghz.com/putovobokulana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sopazizepo.rf.gd/jazusawom.pdf
    • http://xifuwotemukoxax.rf.gd/what_are_the_common_characteristics_of_charismatic_and_transformational_leadership.pdf
    • http://sobojagi.epizy.com/51168552867.pdf
    • http://kokogaradomope.epizy.com/linawozapaniledibisak.pdf
    • http://wulibazosuxib.onlinewebshop.net/weighted_average_cost_of_capital.pdf
    • http://nikejubefip.epizy.com/millennium_development_goals_ghana.pdf
    • http://ravuxigud.epizy.com/action_video_movies.pdf
    • http://laganinol.rf.gd/globalization_and_neoliberalism_the_caribbean_context.pdf
    • http://muvemaxadal.onlinewebshop.net/assessment_definition_in_education.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_off0000f25f.bin
1ab9a2faa23bace571f89473fa15badd8bc4707a61018a84cc0559cc90ed3fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5320 bytes
font_01_sfnt_off00010461.bin
8f83c16409cac335a7f83eee3d1e85cb37bed1f14f6817532d6e29c0309d6ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 11336 bytes
font_02_sfnt_off00012ada.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 4324 bytes

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