Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbf7f6c04226c26…

MALICIOUS

PDF

116.9 KB Created: 2021-04-05 09:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004bd3880e822c340e2295030e766117 SHA-1: d767ee468be965d49e42f6dfe217bab38dabe5ef SHA-256: 3fbf7f6c04226c262a100a7b0702e22b41d768183bc8182c3cc88231caaa62e5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary URL, 'https://soxebez.ru/award?keyword=aviation+weather+book+pdf+download', suggests a lure related to downloading content, which is a common phishing tactic. The presence of embedded URLs and the overall structure strongly suggest this PDF is part of a phishing campaign or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/award?keyword=aviation+weather+book+pdf+download
    • https://cdn-cms.f-static.net/uploads/4454290/normal_6052d69a939dc.pdf
    • https://cdn-cms.f-static.net/uploads/4403539/normal_6011c7d29c530.pdf
    • https://cdn-cms.f-static.net/uploads/4485935/normal_60677fe82c0d1.pdf
    • http://ruluzuzadol.mypressonline.com/cell_phone_addiction_essay.pdf
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/2507617.pdf
    • http://mapugukabazewu.scienceontheweb.net/toxoplasmosis_cerebral.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_604b0f78e2af3.pdf
    • http://sukutoxuwurif.mywebcommunity.org/40582067027.pdf
    • https://cdn-cms.f-static.net/uploads/4379387/normal_604f55a238ccb.pdf
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5fca2b63f3089.pdf
    • http://lebojabufi.medianewsonline.com/lisuzeg.pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/5890958.pdf
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5fcef590713d8.pdf
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/mizafopajidufu.pdf
    • https://cdn-cms.f-static.net/uploads/4470977/normal_601e74e88a4ee.pdf
    • https://nemaxalifaxibox.weebly.com/uploads/1/3/4/6/134627725/kowosuxogibin-xobovurikidilum.pdf
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/45960929.pdf
    • https://cdn-cms.f-static.net/uploads/4493227/normal_5fe8d2e8f2210.pdf
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/4527954.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_605947c709f53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takurugilij/grade_2_listed_building_guidelines.pdf
    • https://s3.amazonaws.com/wupixufekijax/xiguzefevunumaliri.pdf
    • https://s3.amazonaws.com/zopenave/alcatel_one_touch_fm_manual.pdf
    • https://s3.amazonaws.com/fosagobomap/ferenupapivenarofi.pdf
    • https://s3.amazonaws.com/bibejovixapis/sikamamewid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016fb7.bin
453a127d486f848df1b186619b95fe3fcecc4dcc1c6313ade6eceb29db04d47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB7 5296 bytes
font_01_sfnt_off000181cd.bin
c06960f3774c104f2dc52bd4c23e310822dba2f08f003b97c51d921a72350b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181CD 13360 bytes
font_02_sfnt_off0001aeff.bin
812330b2adb7441ce47435602b6d663f9fa409886ce43955143e2d3ccb2f286a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEFF 16472 bytes

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