Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bde1d5ff9a6728…

MALICIOUS

PDF

82.5 KB Created: 2021-03-25 07:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 27235021c6d4c447c277ba8174b6024f SHA-1: b590c5c0888cc87dd9977b29db0f53c7e15a2400 SHA-256: 21bde1d5ff9a6728f0513dd31bfffb2817a09e0e4074e71d563a86fd2cdf898e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=avast+mobile+security+pro+apk+onhax PDF link annotation
    • http://evakuator-uga.ru/35120813698av0ow.pdfIn PDF document text
    • http://girlita.space/harmony_dreamtime_deluxe_comfort_booster_car_seat_reviews4uner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_6009665226621.pdfIn PDF document text
    • http://cartest.pro/lizexafefifaxuxizipokuker2eeuj.pdfIn PDF document text
    • http://axecheat9.xyz/how_can_scrum_master_gain_influence_without_authorityfq6i8.pdfIn PDF document text
    • http://xijeboxebifariz.22web.org/western_digital_my_cloud_ex2_ultra_8tb_review.pdfIn PDF document text
    • http://samozanyat.info/bigazizlj8di.pdfIn PDF document text
    • http://storezone.info/cenote_chilam_balam_como_llegarpevyo.pdfIn PDF document text
    • http://kupiokno.su/soren_kierkegaard_either_oraso25.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/fanagateguvoterudimozuvaj.pdfIn PDF document text
    • http://moneymaya.site/edjing_mix_dj_music_mixer_apk_downloadwb6nl.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/best_mod_for_medieval_2_total_warcjue6.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/pukofomumogibeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5ffb1a244c185.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/34769086501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_601de64192952.pdfIn PDF document text
    • http://lg-copyright.com/short_stories_in_english_with_spanish_translationogr8x.pdfIn PDF document text
    • http://webmastervlad.ru/rabeviwiwiv9453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedagavuvux.epizy.com/jejofo.pdfIn PDF document text
    • http://zinabukupomij.rf.gd/77120466711.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5596 bytes
SHA-256: cd670f4d84bc6e21751ec04edcc6a00d3cdc834538b1deaa2a9c9ebb4beb872c
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10872 bytes
SHA-256: bd86a8adad31cff53ba2efcb49c4572f773adb45869c87e8392c7389df819b04
font_02_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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