Malicious PDF — malware analysis report

Static analysis result for SHA-256 3456dbe68333bd57…

MALICIOUS

PDF

103.3 KB Created: 2021-02-27 19:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 51a7934c46719f4d1c8c7ce2848003bd SHA-1: 77458da4a1fda9dc1bfacba3c5b60d201eb6b476 SHA-256: 3456dbe68333bd5749b97b4606330216ce533458fc8d23b0e398b21c10bb1171
274 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as part of a link farm or known malicious redirector infrastructure. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates a credential phishing lure impersonating a brand, directing users to a malicious URL. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://molesomux.weebly.com/uploads/1/3/2/6/132681378/lukusolelumaz_lerimovibuzozuf_burul.pdf.
  • 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://dafemum.ru/strik?utm_term=medicare+claims+processing+manual+chapter+12+section+40 In PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/lukusolelumaz_lerimovibuzozuf_burul.pdfIn PDF document text
    • http://xomapometafa.iblogger.org/funny_logical_questions_and_answers_in_english.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/watuwadulusudegi.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/sowofeniw-tomunizofimule-wusonojezexi-tajup.pdfIn PDF document text
    • http://rokonagusedat.22web.org/h2so3_strong_or_weak_base.pdfIn PDF document text
    • https://taxupati.weebly.com/uploads/1/3/4/8/134891344/abb37ecd.pdfIn PDF document text
    • https://velelamoju.weebly.com/uploads/1/3/1/4/131438442/a9e433998ba4915.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/sojevemu.pdfIn PDF document text
    • http://jakivuxevova.22web.org/27885658282.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/4237694.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/d572930b04f2.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/kobinusufuxet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugotival.epizy.com/excel_spreadsheet_not_full_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/remove_clock_icon_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/zedipazegodak.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/92844313833.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/luridiroretomubig.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/rixip.pdfIn PDF document text
    • http://wupubobetob.epizy.com/daxusizikanobozuzu.pdfIn PDF document text
    • http://litafiwu.epizy.com/speaker_volume_booster.pdfIn PDF document text
    • http://wutodabegaf.epizy.com/72849750397.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/baldi_s_basics_mario_mod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000156b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B6 5908 bytes
SHA-256: 37a49e7f8fc149ad15a8becabcb6ac3096355b5f673e392d2783b06db3ab449f
font_01_sfnt_off00016ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB8 10740 bytes
SHA-256: bd2033fe6bb13a6b55796a5ebf96290f2074017972df44d0bb13c9d7cb94e79f