Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b739644b6d0e2d…

MALICIOUS

PDF

118.0 KB Created: 2021-03-30 02:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 678ecd3bb2b469cb5f5f775f23ee0eb5 SHA-1: 77b639cad6b8b95a9b4d916d97fe243081add5d6 SHA-256: 72b739644b6d0e2d93fc781a6ea5298aaab67d1925005c735b0b027489118087
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, a technique often used in phishing or SEO spam campaigns. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious or spam content. No scripts were extracted, but the overall structure points to a link-farming or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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-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://seumenha.ru/strik?utm_term=exalted+2e+artifacts
    • http://kfnwejfnkwheklf.space/kozepusamumukuxebigudlllbx.pdf
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/rodukowem.pdf
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/8240559.pdf
    • http://invitesistem.ru/avett_brothers_brooklyn_song_lyricsqfq4d.pdf
    • http://copyrighthelpptteam.com/herpes_genital_fotos_inicio9c1xn.pdf
    • http://kovefubiwajulo.22web.org/allcast_premium_apk_full.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/9010460.pdf
    • https://darenufu.weebly.com/uploads/1/3/1/4/131438483/8615088.pdf
    • http://wamuterireted.iblogger.org/public_speaking_books_free.pdf
    • http://vidclips.design/zujoniwokuvedofolmuown.pdf
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/479793.pdf
    • http://fishing-rods2.club/acrobat_pro_dc_trial_version_freee5re4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/diwitapezu/css_grid-_template-_rows_repeat.pdf
    • https://uploads.strikinglycdn.com/files/27119273-2015-4370-b151-4e5b35c75a19/402834503.pdf
    • https://s3.amazonaws.com/jijumupade/android_box_astro_lowyat.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/rewebasosozivadipi.pdf
    • http://fijivenuzamiw.rf.gd/yamaha_mate_50_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/56355f18-46ac-4714-9bdb-73835576a866/sarah_cynthia_sylvia_stout.pdf
    • http://gawukafiwinexi.epizy.com/11274143760.pdf
    • https://s3.amazonaws.com/zuxime/piriformis_pain_in_buttocks.pdf
    • https://s3.amazonaws.com/diwitapezu/golden_song_season_3_facebook.pdf
    • https://s3.amazonaws.com/vebogotexaf/3dmark_2017_free.pdf
    • https://s3.amazonaws.com/rodigapigeta/45250273579.pdf
    • https://uploads.strikinglycdn.com/files/5017189d-b4b7-4aca-9769-90af82bb4f9a/2018_honda_civic_ex_maintenance_schedule.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/change_imei_apk.pdf
    • https://s3.amazonaws.com/bibejovixapis/sony_ht-ct780_review.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_off0001938a.bin
a78b64c3d336270af469eca1d332bfd1565fb14b212bc16aca65a3563de9bfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1938A 5172 bytes
font_01_sfnt_off0001a538.bin
56492b7641802dc4284fd65b71a771d9aff1f1c6339be19e327211ed06bd1f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A538 10792 bytes

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