Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9ca0eb4fbafab1…

MALICIOUS

PDF

69.6 KB Created: 2021-04-10 00:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b33cc265488e26b4e3a178f6bfedaf1 SHA-1: 985f56123024575f26278adbc4b2b9df5fefd774 SHA-256: aa9ca0eb4fbafab168401d623b3bf570906e64bcc11e6a5fa1ee5a2eb49ab914
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with the primary one being 'https://xezojetit.ru/strik?utm_term=how+to+structure+a+proposal+presentation', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+to+structure+a+proposal+presentation
    • http://vixilebi.iblogger.org/winevejiguko.pdf
    • http://damvglaz1.xyz/24935383824634vn.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/gepikepaloxojob-rujokivinepilil-wiwagufi.pdf
    • https://lazarenebuf.weebly.com/uploads/1/3/4/8/134885148/d5ef11c995ed.pdf
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/f1a0991.pdf
    • http://1-bog.ru/350552157630439w.pdf
    • http://dirozigumifew.scienceontheweb.net/acting_scripts.pdf
    • http://kawasus.scienceontheweb.net/b._com_part_2_auditing_notes.pdf
    • http://besuxiju.22web.org/somivaneres.pdf
    • http://hookup154.online/2008_ford_escape_reviewsb7gp0.pdf
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/f89b19e2ea0.pdf
    • http://vitalia-transports.com/26604690424zzvxx.pdf
    • http://nugawijuxuv.mywebcommunity.org/bsnl_landline_cancellation_letter_format.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zusutifosaj.rf.gd/car_alternator_wiring_diagram.pdf
    • https://s3.amazonaws.com/fewifuwu/100_civics_questions_and_answers_2018.pdf
    • http://bakakixutuv.myartsonline.com/benim_hocam_trke_video_ders_notlar_2020.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_008a90ad114f44f1b225c1785e9e5508.pdf?index=true
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_bf71462745304f389833acf1c9ac0748.pdf?index=true
    • https://s3.amazonaws.com/gupawupigawono/directv_now_guide_app.pdf
    • https://s3.amazonaws.com/gumagabu/72629994953.pdf
    • https://s3.amazonaws.com/dozuga/22660646871.pdf
    • https://s3.amazonaws.com/mexesazaxasa/29096107050.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_off0000d2f3.bin
2cb90436145aab60a0649391c71f80ed55dee5ec3c0ecc73518185477415160d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 4980 bytes
font_01_sfnt_off0000e402.bin
0ab19cb8f564bb8f7c0a36597140ffc7cf11ec34dc2d4fdbaf447608b1253fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 10428 bytes

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