Malicious PDF — malware analysis report

Static analysis result for SHA-256 e272389d1223ef49…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 10:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2487c8ddc225a5a094ad805d84603c5 SHA-1: 2dd65a714c5aa21b94cdd9710f9979f65f45f538 SHA-256: e272389d1223ef49556e70dfce9fd2b163e33e106d96eecbb98af1f5a4b6901f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://zajinet.ru/wix?keyword=iscore+baseball+apk', suggests a lure related to a specific application. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=iscore+baseball+apk
    • http://biniwitovo.mywebcommunity.org/weekly_work_schedule_template.pdf
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/zuzefadapoxul.pdf
    • http://xufikefizot.sportsontheweb.net/gimugitekojemonate.pdf
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/2501658.pdf
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/sidemedilavijetewu.pdf
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/jovubibenezomof-segokijotufazol-wudafilas.pdf
    • http://pofaduxiruk.getenjoyment.net/you_cant_name_a_single_thing_in_this_photo.pdf
    • http://lamaded.mywebcommunity.org/90550519528.pdf
    • https://gokokunebede.weebly.com/uploads/1/3/0/8/130874183/1306852.pdf
    • https://cdn.sqhk.co/gitogozune/iajegcL/electron_configuration_of_calcium_20.pdf
    • https://cdn.sqhk.co/rudixika/yjiY1ib/89661108530.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38f582e4-c2e2-493a-b187-77f86197aa44/1462646705.pdf
    • https://s3.amazonaws.com/jobavo/jalasidarujidede.pdf
    • https://uploads.strikinglycdn.com/files/561174ac-fbd4-4379-802b-3ebd4bc40734/how_do_i_access_my_fios_router.pdf
    • https://uploads.strikinglycdn.com/files/52bf5377-b019-42c4-9bd9-44310a85d639/zodapepikuruj.pdf
    • http://dodipovoz.epizy.com/46319799459.pdf
    • http://pabewuvuxaf.onlinewebshop.net/wimiveduvopu.pdf
    • https://s3.amazonaws.com/warapagefasovi/nikuk.pdf
    • http://mabezaze.epizy.com/mukavotojodemu.pdf
    • https://uploads.strikinglycdn.com/files/ff5637d5-4e9d-4af0-8fc7-150cd592ecd1/how_to_fix_my_maytag_refrigerator_ice_maker.pdf
    • http://papelevinijefab.rf.gd/94947957950.pdf
    • http://basefiwan.rf.gd/174685862.pdf
    • http://sedobuxekazadi.rf.gd/ketoacidosis_diabetic_guidelines_ada.pdf
    • https://uploads.strikinglycdn.com/files/da4cab0e-37d9-4a2f-87b9-3177ec20c972/how_can_you_tell_if_a_painting_is_a_reproduction.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_off0000f89e.bin
6b533ce4fb1b085eb6506bbc2eb1b77c32752c43a3cd3a208a8fca2979afef55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 5068 bytes
font_01_sfnt_off000109ea.bin
43c5c61f969f5a586bdeaef86766835895bb392a0f2fdfee6fea6bf8b9b402c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 11140 bytes

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