Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c16ecaa74397b1…

MALICIOUS

PDF

83.0 KB Created: 2021-03-25 05:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ecbcfe45beb505a2fe7dfc4e1577320 SHA-1: 203421b67e75195b7b8a8772f2b92544ec30246d SHA-256: 43c16ecaa74397b17ddc63fafc00385c43e521d0e810cfae7cf689ce54f1bc19
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://jumiwimov.ru/wix?keyword=ionic+formulas+worksheet', which is likely a phishing or malware distribution site. The document body is heavily obfuscated, but the presence of the malicious URL and the overall detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=ionic+formulas+worksheet
    • https://cdn.sqhk.co/sewuvavimebi/wBgggAL/fireboy_and_watergirl_unblocked_77.pdf
    • https://cdn.sqhk.co/pajugeluj/0jbEmii/zujivefabinavamevajodegok.pdf
    • https://cdn.sqhk.co/nifodotiriru/BLhiXN1/article_spinner_and_rewrite.pdf
    • https://cdn-cms.f-static.net/uploads/4470699/normal_60459cce3ba70.pdf
    • https://cdn-cms.f-static.net/uploads/4462351/normal_603eb2b9025ff.pdf
    • https://cdn.sqhk.co/vilubofi/Ktji9uz/2048_game_8192.pdf
    • https://cdn.sqhk.co/lakivasulis/LVrggie/xuriguwiximididojoxuj.pdf
    • https://cdn.sqhk.co/xuxovunevo/hGmPNgg/emergency_room_technician_salary_georgia.pdf
    • http://zavupefedeba.22web.org/autograph_bengali_movie_song.pdf
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5ff42e3a3aa0d.pdf
    • https://cdn-cms.f-static.net/uploads/4479254/normal_600d9caa7ac74.pdf
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5fe295faf0ab2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fusezumapaj.epizy.com/59601408191.pdf
    • https://uploads.strikinglycdn.com/files/692243ff-81cf-4fd1-91ae-64b6767ab825/pitbull_great_dane_mix_black_and_white.pdf
    • https://uploads.strikinglycdn.com/files/c8aeb2da-9375-416d-a1a8-56e8190d5b15/how_to_install_hp_officejet_pro_8600_plus.pdf
    • https://uploads.strikinglycdn.com/files/b6a48e3e-58a0-4b7d-a7d1-a175e9915d8b/how_to_form_a_prepositional_phrase.pdf
    • http://refewededuxita.epizy.com/52095832005.pdf
    • http://botukavitoku.epizy.com/xutafifo.pdf
    • http://wugadavax.epizy.com/66338452287.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e7.bin
2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 6440 bytes
font_01_sfnt_off000105dc.bin
d3f04cb4b985a2405e21ce11c1f9bb3f51bbfe20186c705f31c362e12089009c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 5216 bytes
font_02_sfnt_off0001177e.bin
d670fd1f8c956aefe2979c10cf5ca8e25788cbeead94156a6a9daa5ded6a5336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 11360 bytes

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