Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4b271ec88168c8…

MALICIOUS

PDF

87.4 KB Created: 2021-04-07 00:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b023bcaa0904d841e2d5ba0251f7b9b4 SHA-1: 77c537a33618306a3193130a70f17aa4c63aa193 SHA-256: 3f4b271ec88168c8c3e4a0304959b0663af2438e6a0df75a1ae49604871a6e10
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and lead to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://resalured.ru/123?utm_term=piriform+ccleaner+professional+edition+license+key', which is likely used for phishing or distributing malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://resalured.ru/123?utm_term=piriform+ccleaner+professional+edition+license+key
    • http://websporizlehd.com/ford_focus_zx3_2003_oil_typexm1wu.pdf
    • http://luxibenuguk.getenjoyment.net/public_administration_course_syllabus.pdf
    • http://itdiscount.info/pebasiraxvayy9.pdf
    • http://helpverifybadges.com/86897457471ymz9m.pdf
    • https://fumevido.weebly.com/uploads/1/3/0/8/130874276/2c34f7.pdf
    • https://pexefosakojoma.weebly.com/uploads/1/3/1/4/131406105/6750118.pdf
    • http://gekodejevotug.medianewsonline.com/sonitonajagewa.pdf
    • http://nubemeketetu.mypressonline.com/53106354589.pdf
    • http://pofuxubilet.sportsontheweb.net/21267053665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ec7b7ba5-cdcc-4e89-b238-e67a68baf7f0/zuludakodaregogiwumotew.pdf
    • http://wirirarosutuki.epizy.com/toshiba_3tb_canvio_connect_ii_hard_drive_review.pdf
    • http://jufabopijogik.rf.gd/semafob.pdf
    • https://s3.amazonaws.com/paropabaru/how_to_adjust_g_shock_time_5522.pdf
    • https://s3.amazonaws.com/pevarijidasalop/bhagam_bhag_full_hd_movie_mp4.pdf
    • https://s3.amazonaws.com/lurutopobi/qa_analyst_manual_testing_jobs_in_toronto.pdf
    • http://mapakifexi.rf.gd/batem.pdf
    • https://uploads.strikinglycdn.com/files/b5af0c4d-04cd-41dd-87ab-4abbd575f48d/sat_test_august_2020.pdf
    • https://s3.amazonaws.com/tedowafomaru/pasos_para_la_misa_catolica.pdf
    • https://s3.amazonaws.com/lanorolowu/52585609256.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_off00011507.bin
3bc77c9e723c4e983da697f01e3c22e126c93cc57e7d433e41c9d5a0614401aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 5468 bytes
font_01_sfnt_off00012794.bin
b16b5b8cfd88e40e4cdce95995534eb5f3b995ef90e775449e70b8b74b4b05ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 11524 bytes

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