Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e8ede22de5d9e6…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 08:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb7c7551eb1fe76ac46c83712af1077 SHA-1: d1dbdef16a92a531e6497df71a3dfc3ca511dc3d SHA-256: 43e8ede22de5d9e6e59976eac0c8cde9f1e97e6079fec94863480c1f29072eb6
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary external URI points to a URL that appears to be a lure for a stoichiometry worksheet. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an intent to redirect users to malicious sites for phishing or malware distribution.

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://pelibifir.ru/wix?keyword=stoichiometry+worksheet+%25234+mass+to+volume+answers
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/muzijevetapin_zokodiw_moxevisap.pdf
    • http://bikumusuzavug.22web.org/vozafona.pdf
    • http://detonic-ro.website/principles_of_mathematics_10_textbookolc2y.pdf
    • http://afracheat4.xyz/printable_multiplication_worksheets_grade_311csw.pdf
    • http://teasmall.space/encyclopedia_meaning_in_bengaliqp8hm.pdf
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/revenajegegozob.pdf
    • http://xazusifiwo.iblogger.org/how_to_use_smart_bp_hr_bracelet.pdf
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/retulowepabefetir.pdf
    • http://future-techno.ru/how_much_does_a_tracfone_cost_at_walmartfrhdm.pdf
    • http://gevifavilovaz.22web.org/diagnostico_diferencial_de_cetoacidosis_diabetica.pdf
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/e8c93a1062.pdf
    • http://tevfikyuce.xyz/269611860166vv4s.pdf
    • http://dagijejawukutu.22web.org/4569572531.pdf
    • https://guzugalaxob.weebly.com/uploads/1/3/4/7/134767263/kuwagu_zepizanetilar_lugimatezufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e17fe3d057434c9681acc34b65e16513.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_04804b57f1274274ac66ffb1d1e1ec4c.pdf?index=true
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_62f17e9b346d4acfa2f569cdeead06ab.pdf?index=true
    • http://xulufavuso.rf.gd/gozumozodogigotasareg.pdf
    • http://fojinejadasetax.epizy.com/lovupuxaxixi.pdf
    • http://legifotuvikib.epizy.com/black_boy_haircuts_designs.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_09ae852f70da4901b93b21004fb15426.pdf?index=true
    • 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_off0000e162.bin
8e4c8cdc5a5bcc09d583e333b3ec5fc78cc166d42be8d2a072317fcb963118fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 5160 bytes
font_01_sfnt_off0000f2df.bin
c001de7654116334bf4659415fc103ad97384d1686b4368690a635a560a0e98b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10308 bytes

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