Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e5a3900c06ee6a…

MALICIOUS

PDF

88.5 KB Created: 2021-03-23 15:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b38f3e6e1e37f5b0f438ef3d8661f1b4 SHA-1: e1748a6225bfbbd363faf9b1420c5516fd45faef SHA-256: 91e5a3900c06ee6a707c98806ce43361175e41c52235bbf2813bd590cacc4031
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous embedded URLs, with the primary one being 'https://resalured.ru/wix?keyword=ps+physics+study+guide+answers'. The document body, though heavily obfuscated, suggests a lure related to 'ps physics study guide answers'. The presence of embedded URLs and the nature of the detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://resalured.ru/wix?keyword=ps+physics+study+guide+answers
    • http://sukutoxuwurif.mywebcommunity.org/40582067027.pdf
    • https://zukunade.weebly.com/uploads/1/3/0/9/130969607/3ce0c930d013.pdf
    • http://vclean-sale.shop/how_long_does_it_take_to_get_good_at_lacrosseh0bdh.pdf
    • http://my-favshopc.online/how_to_turn_on_orbit_sprinkler_system_after_winterbdas5.pdf
    • http://rastet-malysh.ru/girakitafezekololu0k4gs.pdf
    • https://mifopubulu.weebly.com/uploads/1/3/1/6/131637027/devezofi_vosudizafeli.pdf
    • http://xawegap.mywebcommunity.org/how_many_months_is_27_weeks_pregnant_chart.pdf
    • http://enots.space/munimunanikspopa.pdf
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/pigotunenenukubavam.pdf
    • https://vidatizotasajad.weebly.com/uploads/1/3/4/0/134017381/jikomu_velazakud.pdf
    • https://cdn.sqhk.co/pepupiribojo/Tgjhgdx/download_aplikasi_cut_and_paint_game.pdf
    • http://familyit.info/kubarowitevip9txs.pdf
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/gunuzedigedilo_tupolujodolum.pdf
    • https://cdn.sqhk.co/bulixanejad/jgjbgf7/voxiturenutegezog.pdf
    • http://lami-lashes.site/91910212667kenyb.pdf
    • http://cyberlife.store/30095247969b64cc.pdf
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/kerovepukejonutev.pdf
    • http://hurricane1.space/makigosezikisodexilazqv4ov.pdf
    • https://cdn.sqhk.co/nepajenine/hckhdH0/fb_nearby_friends_map.pdf
    • http://decideyouself.fun/493321879703u5qe.pdf
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/nupukame.pdf
    • http://itfamily.pro/5227588935594uvm.pdf
    • https://timurikamaz.weebly.com/uploads/1/3/1/4/131406182/d5960.pdf
    • https://cdn.sqhk.co/toviranevu/ghgUPbC/raj_lab_assistant_answer_key_2016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lonesopuw.onlinewebshop.net/77548986348.pdf
    • http://gipebevu.atwebpages.com/nosinobivivimezir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6c.bin
ef45d6807e0dbee398a614916e607f045e3f171dadbef57c312ee6072f7dda4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 5272 bytes
font_01_sfnt_off00012056.bin
2ce774378ca65f397a4b5284ac96b835f5a90469d6fd7793ae5068dd7b3d87e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 11036 bytes
font_02_sfnt_off000145ab.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 4324 bytes

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