Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adb1b3fc69c44d4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 23:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d97b6d5d2545b46323d01807abcab4 SHA-1: 5d51d053e85d6611ad538ae79655b59e968d6fb5 SHA-256: 3adb1b3fc69c44d4c30bc4e6fe6df6865fe37f1da449368e64ad458fc333d004
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to an 'academic weekly planner', likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9297

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://baarspo.ru/award?keyword=academic+weekly+planner+pdf
    • http://lexaxak.mywebcommunity.org/ragux.pdf
    • https://cdn-cms.f-static.net/uploads/4373782/normal_605c6566da8ba.pdf
    • https://cdn-cms.f-static.net/uploads/4472773/normal_600d5acba521b.pdf
    • http://megidexabaror.mywebcommunity.org/kiwoganazugabepesejamu.pdf
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fe00e7a07c72.pdf
    • http://nobukuxokosiga.mypressonline.com/mexoduwiribosetezal.pdf
    • http://mofirixubutibi.getenjoyment.net/novolog_insulin_sliding_scale.pdf
    • http://kavelizopepi.mywebcommunity.org/the_beautiful_game_podcast_hosts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zodofujeki.atwebpages.com/accounts_assistant_job_description.pdf
    • https://s3.amazonaws.com/vojapu/5_lenguajes_del_amor_para_solteros_gratis.pdf
    • http://sazasewugekupej.onlinewebshop.net/5066893915.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/calendario_2019_escolar_2020_sep.pdf
    • http://rogofideb.onlinewebshop.net/30588764439.pdf
    • http://gudukiderunusu.myartsonline.com/linezelerobo.pdf
    • http://zuputes.atwebpages.com/rosario_a_la_preciosa_sangre_de_jesucristo_el_senor.pdf
    • https://uploads.strikinglycdn.com/files/1b38663a-3df5-4b52-81d8-a16fc8fa5079/26860535807.pdf
    • https://uploads.strikinglycdn.com/files/3f46d851-dad1-4a8d-93ef-1dbfc66c6d0a/kejofonanodapabe.pdf
    • https://uploads.strikinglycdn.com/files/d4a8e3be-a6e6-4388-a55c-e73499426f9d/jack_lalanne_juicers_reviews.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed78.bin
afe58ce6f92d13a31571fd01e5c6551b92c7cbe20fc87627c8d3c0df1df9413b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 4968 bytes
font_01_sfnt_off0000fe4c.bin
8a93f469ffa07e2941d9d0dad57bb7ab905f2e853f064ddaf7490df2dd47d2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 10648 bytes
font_02_sfnt_off0001228e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 4324 bytes

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