Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e445b256bb0801…

MALICIOUS

PDF

66.1 KB Created: 2021-04-07 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e9f0e807a5639fdc1133662332d13d4 SHA-1: 376c25461a70119a80443f3ec7db8d871aa813ee SHA-256: 72e445b256bb080113234b42450378b8edd7565b18eff21996a70ce8b641de9b
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_URI indicating an external URL. The embedded URL `https://seumenha.ru/wix?keyword=line+of+best+fit+worksheet+doc` is the primary indicator of malicious intent, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and external URL point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=line+of+best+fit+worksheet+doc
    • https://cdn-cms.f-static.net/uploads/4390996/normal_6036596454e12.pdf
    • https://cdn.sqhk.co/sobexofap/o5Mggih/lejomakaxa.pdf
    • https://cdn.sqhk.co/jaguwubax/hioBjQ6/dipebaxelawisi.pdf
    • https://cdn-cms.f-static.net/uploads/4470209/normal_605af74950d19.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_604ab41bd2cbb.pdf
    • https://cdn.sqhk.co/tuseliwi/hcchahe/blackwood_forest_abandoned_house.pdf
    • https://cdn.sqhk.co/powedaguja/eFjiid5/20417342722.pdf
    • https://cdn.sqhk.co/vapumojemov/fjbbxCw/skype_free_im_video_calls_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/23d58525-a6ea-40ba-962e-7d46bb2a44d2/8320572166.pdf
    • https://uploads.strikinglycdn.com/files/23369d53-ae6f-4fe8-b6a8-df7b66b987ce/lafupobezatewakisuw.pdf
    • https://uploads.strikinglycdn.com/files/720fc026-e8b5-4844-98e4-bfb16251eaa5/how_to_install_glacier_bay_water_dispenser.pdf
    • https://s3.amazonaws.com/vetamedisoz/bs_player_codec_android.pdf
    • https://uploads.strikinglycdn.com/files/bd15a5ec-cdf0-41ec-b756-a95bf1a6fb07/where_to_dispose_of_old_clothes_near_me.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/lockpicking_level_guide_wow_classic.pdf
    • https://uploads.strikinglycdn.com/files/aeef73ae-7b1c-40d4-b1f7-cb90eabac4e6/dafajumuvi.pdf
    • https://s3.amazonaws.com/mefonevimimix/craft_cms_template_tutorial.pdf
    • https://s3.amazonaws.com/bisiku/space_vehicle_dynamics_and_control.pdf
    • https://uploads.strikinglycdn.com/files/df2e7220-0f68-40c3-8a08-efd003739926/tabipawev.pdf
    • https://uploads.strikinglycdn.com/files/510241af-7acc-43f1-a925-a78cc75be66c/evenflo_car_seat_newborn_insert_weight_limit.pdf
    • https://uploads.strikinglycdn.com/files/597389f0-4468-4f15-9293-b37ed91422ad/how_do_i_fix_my_headphone_jack_on_my_xbox_one_controller.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_off0000c89b.bin
c550f3459c4697f654de6d641ac2ea81ef6267f344f05a2767a4e17800603d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 5104 bytes
font_01_sfnt_off0000da0b.bin
e65cb1a62d3b200cb0be6e8e5a6c1a29716e77f088c62b5e889511717c75b871		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 9816 bytes

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