Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2ff9c4fdf57915…

MALICIOUS

PDF

89.6 KB Created: 2021-03-09 20:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab139c8e85e697723d8db5e74ee3b99c SHA-1: 55eb7ab1af4fa5daced0faf81230c8784f27ab46 SHA-256: dd2ff9c4fdf57915380ae0b2fef3322c92a7e2d5b8c5eb0ffbb334fa59204358
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL pointing to 'nipisod.ru', which is likely part of a phishing or credential harvesting scheme. The document body, though heavily obfuscated, suggests a lure related to 'Base64 to pdf using java'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://nipisod.ru/award?keyword=base64+to+pdf+using+java
    • http://fukuzowi.sportsontheweb.net/cisco_sg200-50_console_port.pdf
    • https://cdn.sqhk.co/falupuvevore/Vn67Ghc/modern_marketing_techniques_ppt.pdf
    • http://zonuvak.medianewsonline.com/is_trop_a_root_word.pdf
    • https://cdn.sqhk.co/fabokofe/ehaigCU/desiree_s_baby_by_kate_chopin_answers.pdf
    • https://cdn.sqhk.co/birenejar/qaJA5hc/oop_strategy_pattern_python.pdf
    • https://cdn.sqhk.co/zavipudajose/hg4jeii/best_video_player_apk_review.pdf
    • https://cdn.sqhk.co/salosegebomi/gQ19wif/diwowetoxuzipare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xisapedugifado.epizy.com/ti_30x_calculator_fractions.pdf
    • http://likutolejit.onlinewebshop.net/echo_srm_230_carb_rebuild.pdf
    • http://lefamuredemupi.epizy.com/fraction_multiplication_worksheets_6th_grade.pdf
    • http://sitovimewimes.rf.gd/44389127870.pdf
    • https://uploads.strikinglycdn.com/files/619c2f9f-8711-4a1e-a6c6-988caffc7481/samsung_galaxy_tab_4_ce0168_screen_replacement.pdf
    • http://futakanawus.onlinewebshop.net/78845147047.pdf
    • https://uploads.strikinglycdn.com/files/7fc30c7f-14a5-4393-9e67-0209b467b250/somewhere_over_the_rainbow_lyrics_and_chords_eva_cassidy.pdf
    • https://uploads.strikinglycdn.com/files/569df3d4-374d-4bb7-9b29-2bb935e8b667/topics_for_chairing_an_aa_meeting.pdf
    • https://uploads.strikinglycdn.com/files/8b0a8933-a262-405f-b131-a073c0b304ea/bupitematebomikopaben.pdf
    • http://gaxilitexu.onlinewebshop.net/how_to_program_a_ge_universal_remote_to_a_orion_tv.pdf
    • https://uploads.strikinglycdn.com/files/c0d3cfcd-76fe-44c4-8b64-6a47a7d00bef/what_is_the_best_topic_for_research_paper.pdf
    • https://uploads.strikinglycdn.com/files/58983f9c-29fc-4783-8191-b6fd43350bb1/topdog_underdog_critical_analysis.pdf
    • https://uploads.strikinglycdn.com/files/646f5812-5b25-4b7f-8fea-3aba7acef17d/d40_nikon_price.pdf
    • https://uploads.strikinglycdn.com/files/f64e7988-6c97-4a3d-be1b-107a4f801cea/talesilufim.pdf
    • https://uploads.strikinglycdn.com/files/c50cb126-577f-4490-bd0e-a47f353f59f9/what_is_mcdonalds_hourly_pay_uk.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_off000118b0.bin
2c753e171d6c4e1910b1f81e283185da946c1a95c09fb4ca7686cd1a26c76058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 5508 bytes
font_01_sfnt_off00012ba4.bin
55c4a5a032d3119b15f173cfef37d69c30c47188b56675a25e42dcff8334ba79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 14264 bytes

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