Malicious PDF — malware analysis report

Static analysis result for SHA-256 838742ede2e50d3e…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 04:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a6179be7b1588d302444eb1e031aab9 SHA-1: 135583162ea25b0a2b3a49fda2c6d2abc700bff7 SHA-256: 838742ede2e50d3e421c34c969be33e228f01d03814a5ac4f1c3c603881bb235
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a heuristic specifically identifying a "PDF_SEO_LINK_FARM" pattern. The document body, though heavily obfuscated, contains text related to 'T test statistics table', suggesting a lure. The presence of multiple unknown URLs, including one pointing to a potential link farm, indicates a malicious intent to redirect users. No scripts were extracted, but the overall structure and heuristics point towards a malicious document designed for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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://resalured.ru/wix?keyword=t+test+statistics+table
    • http://lg-copyrightforms.com/kosedatnuyf0.pdf
    • https://cdn-cms.f-static.net/uploads/4402956/normal_603a708192979.pdf
    • http://my-favshopc.online/schotten_baumann_reactionibusl.pdf
    • http://ompala.store/muxuwoxajowuxafh5wka.pdf
    • https://basexexax.weebly.com/uploads/1/3/4/3/134308464/6693615.pdf
    • https://cdn-cms.f-static.net/uploads/4474456/normal_601998183e15f.pdf
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/mekujorekivovulixa.pdf
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/tebafipopuzegot.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/dubetix.pdf
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/vujorosufimov-sodik-sarox.pdf
    • https://cdn-cms.f-static.net/uploads/4481291/normal_604b7003c5e1d.pdf
    • http://trenolgia.buzz/kukebosifaduutufo.pdf
    • https://cdn-cms.f-static.net/uploads/4454435/normal_6013a09b782b1.pdf
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5ff24b2dcac8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kufazete/formal_shirt_pattern_design.pdf
    • https://s3.amazonaws.com/nezanurugega/libro_la_trampa_de_satanas_gratis.pdf
    • https://s3.amazonaws.com/vovopafubipu/ratetivumosuwufokuba.pdf
    • https://s3.amazonaws.com/dikobepibelun/pepeteri.pdf
    • https://s3.amazonaws.com/xirixepo/kitchenaid_pro_600_kp26m1xer.pdf
    • https://s3.amazonaws.com/kikunojulejuj/bujigod.pdf
    • https://s3.amazonaws.com/wozoxub/47838800162.pdf
    • https://s3.amazonaws.com/towakog/gameday_media_guide.pdf
    • https://s3.amazonaws.com/galinikagopit/60584749071.pdf
    • https://s3.amazonaws.com/wifukedot/tripura_cartoon_movie_in_tamil.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_off0000f867.bin
fc08ea1c44a29785b45bc626536e826769d6be595d572ecb376d960e506b60db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 4784 bytes
font_01_sfnt_off000108bc.bin
13d4c3528d1a66c309f37edbebe39271fa54068f3c92dbdc8ea4be7ab36970d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 11048 bytes

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