Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dd24be4a9881a7…

MALICIOUS

PDF

110.6 KB Created: 2021-06-01 12:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bf25e5438f552d88f9d3f922abe368 SHA-1: 868acb8559a18505f9ff5e9198a1e82e67dffc9d SHA-256: 52dd24be4a9881a7e3cbc96997109d7252cb20d6116d0177d6713770bfff8180
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to distribute malicious content or phishing pages. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=sarathi+pune+answer+key+2019
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/zefezeb.pdf
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/luvaxi.pdf
    • https://litefobobufi.weebly.com/uploads/1/3/5/3/135326689/2029177.pdf
    • https://tugupititu.weebly.com/uploads/1/3/4/8/134887320/kavodu.pdf
    • https://cdn-cms.f-static.net/uploads/4377697/normal_602560ba442ed.pdf
    • https://static.s123-cdn-static.com/uploads/4421960/normal_5fe2dadf5ae84.pdf
    • https://cdn-cms.f-static.net/uploads/4466689/normal_603b14965d4ab.pdf
    • https://ramujodavuratot.weebly.com/uploads/1/3/4/6/134667495/79090b15d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://zezimin.pbworks.com/w/file/fetch/144412056/vobobevedotikire.pdf
    • https://uploads.strikinglycdn.com/files/298fe467-9f9f-43d2-afd1-6d06c754ad34/sketchup_make_unique.pdf
    • https://uploads.strikinglycdn.com/files/d156be6c-2dfe-40c5-91f5-64dee6d131c4/blackweb_wireless_charger_walmart.pdf
    • http://nosiravuga.pbworks.com/w/file/fetch/144432612/avro_bangla_typing_software_free_download.pdf
    • https://uploads.strikinglycdn.com/files/2a5d656c-3dd4-43e8-9408-b651d1f25618/78867648414.pdf
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144423909/51261903338.pdf
    • https://uploads.strikinglycdn.com/files/44587c1d-f575-4901-b392-4f5caec5c4b7/65770029206.pdf
    • https://uploads.strikinglycdn.com/files/0b036725-3d25-405a-8827-23388c4b021d/city_mini_gt_stroller_car_seat_adapter.pdf
    • https://uploads.strikinglycdn.com/files/6565c9fa-f83d-407e-ab32-360d1c3d26dc/washington_dc_weather_in_late_january.pdf
    • http://bekivuxuga.pbworks.com/f/vobumo.pdf
    • http://nusuwoxub.pbworks.com/f/how_much_does_it_cost_to_open_a_kung_fu_tea_franchise.pdf
    • http://fevawigo.pbworks.com/f/cities_skylines_traffic_mods_download.pdf
    • https://uploads.strikinglycdn.com/files/e433c82b-80a2-4fe4-a76f-73ea14e57cc2/cortisone_shot_in_knee_painful.pdf
    • https://uploads.strikinglycdn.com/files/c83b0b98-29ec-4cda-ac11-ed74ab60e7f0/19106597730.pdf
    • http://rimogeto.pbworks.com/w/file/fetch/144427284/neo_bomberman_apk_android_descargar.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d1f.bin
3a6b442e1f83761ce98c01c0181ee1bf1f153737913c38806975bb966af8b6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 5720 bytes
font_01_sfnt_off000140a9.bin
bd90f462655cc068fe3bc44f9d64a501a46b137af7986b447bebb26de131bfcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 10812 bytes
font_02_sfnt_off00016526.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16526 16204 bytes
font_03_sfnt_off00017a91.bin
4a4ef682559bca2e6eb3e5dae343b426615ff0704110bfe4c9ecfce30c0059ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A91 15560 bytes

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