Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfb74730a407a9f…

MALICIOUS

PDF

84.9 KB Created: 2021-03-20 04:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 314e4c9ecec18aae69763319d30a6e7f SHA-1: 3a3aa9392b255f0668b20b8c0e13c2f5160510af SHA-256: 8cfb74730a407a9f4c779c2f2fb9aa071ebb44796dab1ad4021216f4a0d9ff5a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated for SEO purposes, suggesting a link farm or phishing lure. The presence of a password archive lure heuristic indicates an attempt to bypass gateway security by encrypting a payload. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirection to malicious sites or the delivery of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/award?keyword=ancient+cities+of+indus+valley+civilization+pdf
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/551b37.pdf
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/6141283.pdf
    • http://jiludedo.iblogger.org/97000457161.pdf
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/domivew_giwexe_vazibiwapam.pdf
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/luzifodidogavuwegiz.pdf
    • https://rujafamuzesoka.weebly.com/uploads/1/3/5/3/135339602/582c54975f408e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_3dad0d3fac2e4a8ca59ce74bd34d0549.pdf?index=true
    • http://kesugonapopuw.epizy.com/lubega.pdf
    • http://weguxuwe.epizy.com/what_are_the_types_of_relation_in_function.pdf
    • https://s3.amazonaws.com/sowirutelevolur/adobe_reader_pro_for_pc_free.pdf
    • https://s3.amazonaws.com/dadupawo/wafevurizew.pdf
    • http://jozixal.epizy.com/73723393825.pdf
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_5b6227f08b3543b3947a66bc50034c42.pdf?index=true
    • http://xejolufu.epizy.com/reinforced_concrete_design.pdf
    • http://nufurezoguboli.epizy.com/66580247284.pdf
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_ff817f94d9524728a4051d96dc26ab3f.pdf?index=true
    • http://bixogonabu.epizy.com/apple_after_hours_earnings_report.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/38231148273.pdf
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_9d742c8a4c254d9dbeff3763b8166bda.pdf?index=true
    • https://s3.amazonaws.com/remavuj/first_grade_math_worksheets_printable.pdf
    • https://s3.amazonaws.com/poresi/woxipedaz.pdf
    • https://s3.amazonaws.com/wudibirewuduto/95536349360.pdf
    • https://s3.amazonaws.com/lomogas/vezevufuzibotatenudog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff12.bin
46e83c0167423b768be69e7107f4ec7c2990a63918df32803fae564d255dfed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 3396 bytes
font_01_sfnt_off00010b21.bin
d57e130421d93d487cfd68d1573fbe90f714aed701965fba6f25728762213bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 5256 bytes
font_02_sfnt_off00011d36.bin
03eaca7033be285798902fa11b9cdb78ae9df11a28cc193d8028bb08b37d6bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 12308 bytes

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