Malicious PDF — malware analysis report

Static analysis result for SHA-256 5755ad2e2f1a831c…

MALICIOUS

PDF

69.8 KB Created: 2021-03-22 20:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a26caf472c12c3ce8c85ba49cd4cb041 SHA-1: 6d247bfe230d626b49946d30b6bf56d3028c79b9 SHA-256: 5755ad2e2f1a831c3741d67e5a10a0ab383175c559cac945e86124fd86ed7ded
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it's designed to host numerous external links. The document body, though partially corrupted, suggests a lure related to downloading a free grammar book. The presence of multiple external URLs, including one flagged as potentially malicious, supports the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=telecharger+livre+grammaire+fran%25C3%25A7aise+gratuit
    • http://xibawolafubiz.getenjoyment.net/arquitectura_neoclasica_en_espaa.pdf
    • http://rasezatoxefu.mygamesonline.org/what_does_culture_mean_in_geography.pdf
    • http://mujabelor.mywebcommunity.org/isospora_canis_tratamiento.pdf
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/e7023c.pdf
    • http://zegobudipaju.mywebcommunity.org/anatomia_e_fisiologia_do_pncreas.pdf
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/zesuserujovizefeki.pdf
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/7877888.pdf
    • http://nemosixumeki.mypressonline.com/dell_latitude_e6410_charger.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pevarijidasalop/4117673672.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/acop_l8_risk_assessment_template.pdf
    • https://s3.amazonaws.com/makumapikeze/free_template_cv_psd.pdf
    • http://murapimopavopa.myartsonline.com/tagifuxi.pdf
    • https://s3.amazonaws.com/rezugekolaba/60984748916.pdf
    • https://s3.amazonaws.com/zumomasugipeno/how_to_writing_survey_report.pdf
    • https://s3.amazonaws.com/kevava/calendar_invite_outlook_template.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_8dac61cfb82d485893f463e51f21d459.pdf?index=true
    • http://wobanunep.myartsonline.com/difference_between_ocr_omr_and_micr_in_tabular_form.pdf
    • http://roxujewov.myartsonline.com/23303084666.pdf
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_06278b64a651418da3bf8e79162bb423.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/witufinedaxuromev.pdf
    • https://s3.amazonaws.com/wewuxuviwar/antimicrobial_susceptibility_testing_protocols.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_off0000d1ad.bin
37b3bbd4f450677cabce849cbfd8f6d89da04c9dc174440f532a61efb3db6ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 5484 bytes
font_01_sfnt_off0000e3f3.bin
2fda2111df3b2775b01ece677279d01131c153bc9d9e6715df4446901d6770c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 11000 bytes

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